Meiosis teaching demonstration model

Abstract

The invention relates to the field of teaching aids, and provides a meiosis teaching demonstration model, in which a demonstration board is used as a demonstration substrate, and a genetic material clip is used in cooperation to form a chromosome model. Two groups of power devices (including an adsorption end I, a power end I, an elastic connecting rope, an adsorption end II, a power end II and an elastic connecting rope) are utilized to display the whole process that primary sperm cells are split twice to form four sperm cells, and in addition, after chromosome migration is completed, the power end I and the elastic connecting rope as well as the power end II and the elastic connecting rope are separated into four sperm cells. According to the model, two cell division processes can be continuously completed on the same demonstration board, the whole meiosis process is visual, continuous and simple and convenient to operate, the difficulty of understanding of students is greatly reduced, and meanwhile, the students can participate manually in the whole process, so that the purposes of teaching through lively activities and conveniently achieving demonstration teaching are achieved.

Description

Technical Field

[0001] The invention relates to a teaching demonstration model, in particular to a meiosis teaching demonstration model applied in the field of teaching tools. Background Art

[0002] Meiosis is a special type of division that occurs during the maturation of reproductive cells in sexually reproducing organisms. In this process, DNA is replicated once and the cells divide twice in succession. As a result, the number of chromosomes in the four daughter cells is only half of that in the mother cell. It is an important examination point and difficulty in biology teaching.

[0003] The utility model patent CN202021388025.0 specification discloses a teaching model for demonstrating meiotic chromosome changes, including: a chromosome component and two chromatid components; the chromosome component and the two chromatid components are slidably connected, and the chromosome component and the chromatid component are slidably connected to each other so that the positions of the chromatid component and the chromatid component can be relatively transformed, thereby showing the different changes of chromosomes in the early, middle and late stages of meiosis. The chromosome components can be combined or separated to show the changes of the chromosome "dividing into two" in meiosis.

[0004] The invention patent CN202010333086.5 specification discloses a dynamic meiosis model for biology teaching and its use method. Teachers or students independently construct physical models and adopt dynamic demonstration methods to innovatively introduce modular chromosome unit models. Different chromosomes are formed based on functions such as color change, connection and separation. The flexibility of coordination between chromosome unit models is utilized to highly simulate the meiosis process for teaching, which greatly restores the migration and separation of chromosomes during cell division. Understanding the meiosis process in an intuitive and simplified form can achieve twice the result with half the effort.

[0005] The meiosis process demonstrated in the above two patents mostly focuses on the exchange of chromosome genetic material and chromosome separation, and neither of them continuously displays the entire process of meiosis, which will cause certain difficulties for students to understand and it is difficult to achieve the expected teaching objectives. Summary of the invention

[0006] In view of the above-mentioned prior art, the technical problem to be solved by the present invention is that the meiosis process demonstrated by the existing meiosis teaching aids mostly focuses on the exchange of chromosome genetic material and chromosome separation, and the whole process of meiosis is not continuously displayed, which will cause certain difficulties for students to understand and it is difficult to achieve the expected teaching objectives.

[0007] In order to solve the above problems, the present invention provides a meiosis teaching demonstration model, including a demonstration board, the demonstration board including a board body, genetic material is placed in the board body, the genetic material is composed of a plurality of clips, the upper end of the board body is chiseled with a layout groove, the side wall of the board body is chiseled with a plurality of through holes, the plurality of through holes are respectively plugged with an adsorption end 1, a power end 1, an adsorption end 2 and a power end 2 that match themselves, and the adsorption end 1, the power end 1, the adsorption end 2 and the power end 2 are all made of magnetic materials, according to the installation positions of the adsorption end 1, the power end 1, the adsorption end 2 and the power end 2 , the adsorption end 1, the power end 1, the adsorption end 2 and the power end 2 are respectively divided into two groups, the two groups of adsorption end 1 and the power end 2 are respectively distributed on the opposite side walls of the plate body, and the power end 2 located on the same side wall is evenly distributed on both sides of the adsorption end 1, the two groups of power end 1 and the adsorption end 2 are respectively distributed on the other opposite side walls of the plate body, and the adsorption end 2 located on the same side wall is evenly distributed on both sides of the power end 1, multiple adsorption ends 1 and adsorption ends 2 are respectively adsorbed with the clamp, multiple power ends 1 with matching positions are adsorbed to each other, and multiple power ends 2 with matching positions are adsorbed to each other;

[0008] An elastic connecting rope is fixedly connected between the adsorption end 1 and the adjacent power end 1, and an elastic connecting rope is fixedly connected between the power end 2 and an adjacent pair of adsorption ends 2. Before the power end 1 and the power end 2 are installed and inserted into the through hole, the excess elastic connecting rope is respectively wrapped around the power end 1 and the power end 2. The elastic connecting rope is laid in the laying groove, and a sealing strip matching the elastic connecting rope is fixedly embedded in the upper opening of the laying groove.

[0009] In the above-mentioned meiosis teaching demonstration model, the entire meiosis process is straightforward and continuous, and the operation is simple, which greatly reduces the difficulty of students' understanding. At the same time, students can participate in it, making learning entertaining and facilitating the purpose of demonstration teaching.

[0010] As a further improvement of the present application, the surface of the demonstration board is coated with a magnetic coating, and the adsorption force between the demonstration board and the clip is smaller than the adsorption force between the clip and adsorption end one and adsorption end two. The adsorption force between the demonstration board and the clip is used to simulate the cytoplasmic resistance of chromosomes during meiosis, making the demonstration more realistic.

[0011] As a further improvement of the present application, multiple groups of elastic hoses are arranged in the layout groove, and multiple elastic connecting ropes pass through the elastic hoses respectively to avoid the scattered elastic connecting ropes from being entangled together, which is not easy to affect the dragging of power end one and power end two and the demonstration effect.

[0012] As a further improvement of the present application, the adsorption end 1 and the power end 1 or the adsorption end 2 and the power end 2 connected to the same elastic connecting rope are printed with the same color, and the adsorption end 1 and the power end 1 or the adsorption end 2 and the power end 2 connected to different elastic connecting ropes are printed with different colors, so as to determine the dragging target of the power end 1 or the power end 2, which is convenient for demonstrating the operation.

[0013] As another improvement of the present application, the sealing strip includes a rubber strip, and finger grooves are chiseled at the four outer corners of the rubber strip to facilitate the removal of the sealing strip and the maintenance and replacement of the structure in the groove by the user.

[0014] As another improved supplement of the present application, the adsorption end 1, the power end 1, the adsorption end 2 and the power end 2 have the same structure. Taking the adsorption end 1 as an example, the adsorption end 1 includes an adsorption magnetic block, which is inserted into the through hole. A rotating groove is drilled at one end of the adsorption magnetic block close to the layout groove, and a connecting rod is inserted in the rotating groove. A sealing ring matching itself is fixedly connected to the opening of the rotating groove, and the sealing ring is sleeved on the outside of the connecting rod. One end of the elastic connecting rope is fixedly connected to the connecting rod, and the excess elastic connecting rope is wrapped around the connecting rod. When the elastic connecting rope is pulled, the connecting rod can replace the adsorption end 1 to rotate as a whole, thereby increasing the stability of the demonstration board during the demonstration.

[0015] As another improvement supplement to the present application, an anti-slip plate is fixedly connected to the end of the connecting rod away from the adsorption magnetic block, and a chamfer is provided on the outer wall of the anti-slip plate close to the adsorption magnetic block. The presence of the anti-slip plate can prevent the elastic connecting rope from directly detaching from the adsorption end. On the other hand, the chamfer can reduce the wear of the elastic connecting rope and the anti-slip plate, making the elastic connecting rope less likely to break.

[0016] As another improvement of the present application, the genetic material further includes a pair of semicircular magnets, a pair of fixed rods and a plurality of combined units, the two semicircular magnets are adsorbed to each other, and the adsorption force between the semicircular magnet and the adsorption end one and between the semicircular magnet and the adsorption end two are both greater than the adsorption force between two adjacent semicircular magnets, one end of the two semicircular magnets away from each other is fixedly connected with a pair of fixed rods, and the plurality of combined units are connected head to tail to form four groups of complexes, and the four groups of complexes are respectively sleeved on one end of the four fixed rods away from the semicircular magnets;

[0017] The combined unit includes an outer shell and a connecting part. A cavity matching the size of the connecting part is bored at one end of the outer shell away from the connecting part. A magnetic ring is fixedly connected in the cavity, and the magnetic ring is attracted to the connecting part. Two adjacent combined units are fixedly connected through the connecting part and the magnetic ring. A separation pin is inserted in the cavity, and the magnetic ring is sleeved on the outside of the separation pin. A tension spring is fixed between the separation pin and the bottom plate of the cavity groove. An extrusion ball matching the position of the separation pin is fixedly connected to the side wall of the cavity. A positioning groove matching the extrusion ball is bored on the outer wall of the outer shell. The outer wall of the outer shell is of an elastic structure at the location where the positioning groove is bored, while the outer shell is of a hard material at the location where the positioning groove is bored, which facilitates the assembly and disassembly of adjacent combined units, facilitates the operator to quickly replace the combined units, and intuitively demonstrates the process of replacing the genetic material of the chromosome.

[0018] As another improvement supplement of the present application, the outer shell is made of silicone and has different colors. The outer shells of the connected semicircular magnets are installed in the same color in the initial state, and the demonstration will be more obvious when the chromosomes exchange genetic material.

[0019] In summary, in the present application, a demonstration board is used as a display substrate, in conjunction with chromosomes formed by genetic material clamps and two groups of meiotic power devices consisting of an adsorption end one, a power end one, an elastic connecting rope and an adsorption end two, a power end two and an elastic connecting rope, to demonstrate the entire process of primary spermatocytes forming four sperm cells through two divisions. At the same time, the power end one and the elastic connecting rope and the power end two and the elastic connecting rope are used to form two separate cell membranes. The entire meiotic process is straightforward and continuous, and the operation is simple, which greatly reduces the difficulty of students' understanding. At the same time, students can participate in it by themselves, making learning entertaining and facilitating the purpose of demonstration teaching. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a structural schematic diagram of a meiosis teaching demonstration model according to the first embodiment of the present application;

[0021] Figure 2 A side cross-sectional view of a meiosis teaching demonstration model according to a first embodiment of the present application;

[0022] Figure 3 This is a schematic diagram of the structure of the meiosis teaching demonstration model of the first embodiment of the present application after the sealing strip is removed;

[0023] Figure 4 This is a schematic structural diagram of a sealing strip according to a first embodiment of the present application;

[0024] Figure 5 This is a schematic diagram of the connection between the adsorption end 1 and the power end 1 of the first embodiment of the present application;

[0025] Figure 6This is a schematic diagram of the connection between the adsorption end 2 and the power end 2 in the first embodiment of the present application;

[0026] Figure 7 This is a schematic diagram illustrating the first meiotic division according to the first embodiment of the present application;

[0027] Figure 8 This is a schematic diagram illustrating the second meiotic division according to the first embodiment of the present application;

[0028] Fig. 9 This is a structural schematic diagram of the adsorption end 1 of the second embodiment of the present application;

[0029] Fig.10 This is a cross-sectional schematic diagram of the adsorption end 1 of the second embodiment of the present application;

[0030] Fig.11 This is a schematic diagram of the chromosome structure of the third embodiment of the present application;

[0031] Fig.12 A schematic diagram of splitting two adjacent combination units according to a third embodiment of the present application;

[0032] Fig.13 A side cross-sectional view of two adjacent combination units according to a third embodiment of the present application;

[0033] Fig.14 This is a schematic diagram of the split state of two adjacent combination units in the third embodiment of the present application.

[0034] Description of the numbers in the figure:

[0035] 1 demonstration board, 101 board body, 102 layout groove, 2 clip, 3 adsorption end 1, 301 adsorption magnetic block, 302 rotation groove, 303 connecting rod, 304 anti-drop plate, 305 sealing ring, 4 power end 1, 5 adsorption end 2, 6 power end 2, 7 elastic connecting rope, 8 elastic hose, 9 sealing strip, 901 rubber strip, 902 finger groove, 10 semicircular magnet, 11 fixing rod, 12 combination unit, 1201 shell, 1202 connecting part, 1203 magnetic ring, 1204 extrusion ball, 1205 positioning groove, 1206 separation pin, 1207 tension spring. DETAILED DESCRIPTION

[0036] Three implementation modes of the present application are described in detail below with reference to the accompanying drawings.

[0037] The first implementation method:

[0038] Figure 1-6A meiosis teaching demonstration model is shown, including a demonstration board 1, the demonstration board 1 includes a board body 101, a genetic material is placed in the board body 101, and the genetic material is composed of a plurality of clips 2. A layout groove 102 is drilled on the upper end of the board body 101, and a plurality of through holes are drilled on the side wall of the board body 101. The plurality of through holes are respectively plugged with an adsorption end 3, a power end 4, an adsorption end 5 and a power end 6 that match themselves, and the adsorption end 3, the power end 4, the adsorption end 5 and the power end 6 are all made of magnetic materials. According to the installation positions of the adsorption end 3, the power end 4, the adsorption end 5 and the power end 6, respectively The adsorption end 1 3, the power end 1 4, the adsorption end 2 5 and the power end 2 6 are divided into two groups, the two groups of adsorption end 1 3 and the power end 2 6 are respectively distributed on the opposite side walls of the plate body 101, and the power end 2 6 located on the same side wall is evenly distributed on both sides of the adsorption end 1 3, the two groups of power end 1 4 and the adsorption end 2 5 are respectively distributed on the other opposite side walls of the plate body 101, and the adsorption end 2 5 located on the same side wall is evenly distributed on both sides of the power end 1 4, multiple adsorption ends 1 3 and adsorption ends 2 5 are respectively adsorbed with the clamp 2, multiple power ends 1 4 matching in position are adsorbed on each other, and multiple power ends 2 6 matching in position are adsorbed on each other;

[0039] An elastic connecting rope 7 is fixedly connected between the adsorption end 1 3 and the adjacent power end 1 4, and an elastic connecting rope 7 is fixedly connected between the power end 2 6 and an adjacent pair of adsorption ends 2 5. Before the power end 1 4 and the power end 2 6 are installed and inserted into the through hole, the excess elastic connecting rope 7 is respectively wound around the power end 1 4 and the power end 2 6. The elastic connecting rope 7 is laid in the laying groove 102, and a sealing strip 9 matching the laying groove 102 is fixedly embedded at the upper end opening.

[0040] See also Figure 7 Taking sperm cells as an example, the process of the first meiotic division is demonstrated: the power ends 1-4 representing the genetic material are paired and clamped to form four chromosomes after replication. At the same time, the homologous chromosomes complete synapsis to form a tetrad, and the non-sister chromatids in the tetrad exchange genetic material, that is, part of the clamp 2 is exchanged (the figure shows that the shaded part of the clamp 2 is exchanged with the clamp 2 in the adjacent chromosome).

[0041] Then, multiple tetrads are moved to the horizontal middle position of the plate body 101, that is, near the equatorial plate of the primary spermatocyte, and the two groups of adsorption ends 3 are respectively pulled out and adsorbed and fixed to the middle position of the four chromosomes, and the two groups of power ends 4 are pulled respectively. Under the traction of the elastic connecting rope 7, the four chromosomes composed of the clamps 2 will be dragged to the two poles of the sperm cell respectively until the power end 4 with matching position is adsorbed and fixed, and the cell membrane composed of the power end 4 and the elastic connecting rope 7 divides the original primary spermatocyte into two secondary spermatocytes, completing the process of the first meiotic division.

[0042] After the interval of subtraction classification, see Figure 8 , entering the process of the second meiotic division: the two groups of chromosomes are moved to the middle position of the plate body 101 in the longitudinal direction, that is, the equatorial plate position of the secondary spermatocyte, and then the chromosomes are separated into chromosomes clamped by two clamps 2, and multiple adsorption ends 2 5 are pulled out and adsorbed to the middle position of the nearest chromatid respectively, and the two groups of power ends 2 6 are pulled respectively. Under the traction of the elastic connecting rope 7, the chromosomes composed of the clamps 2 will be dragged to the two poles of the secondary spermatocyte respectively until the power ends 2 6 with matching positions are adsorbed and fixed, and the cell membrane composed of the power ends 2 6 and the elastic connecting rope 7 divides the original two secondary spermatocytes into four spermatids, completing the process of the second meiotic division.

[0043] Taking the first meiotic division as an example, in the above process, the initial position of the adsorption end 3 simulates the position of the spindle in meiosis, and the elastic connecting rope 7 simulates the function of the spindle fiber. The adsorption end 3 is the connection position between the spindle fiber and the chromosome, and the power end 4 provides the power for the migration of the chromosome to complete the process of the first meiotic division.

[0044] In the present application, a demonstration board 1 is used as a display substrate, which is a primary spermatocyte in meiosis, a chromosome formed by a genetic material clamp 2, an adsorption end 1 3, a power end 1 4, an elastic connecting rope 7 and an adsorption end 2 5, a power end 2 6 and an elastic connecting rope 7. Two sets of meiotic power devices are used to display the whole process of the primary spermatocyte forming four sperm cells after two divisions. At the same time, the power end 1 4 and the elastic connecting rope 7 and the power end 2 6 and the elastic connecting rope 7 are cleverly used to form two separated cell membranes. The whole meiotic process is straightforward and continuous, and the operation is simple, which greatly reduces the difficulty of students' understanding. At the same time, students can participate in it by themselves, which is entertaining and easy to achieve the purpose of demonstration teaching.

[0045] The surface of the demonstration board 1 is coated with a magnetic coating, and the adsorption force between the demonstration board 1 and the clip 2 is smaller than the adsorption force between the clip 2 and the adsorption end 1 3 and the adsorption end 2 5. The adsorption force between the demonstration board 1 and the clip 2 is used to simulate the cytoplasmic resistance of chromosomes during meiosis, making the demonstration more realistic.

[0046] See also Figure 2-3 A plurality of groups of elastic hoses 8 are arranged in the arrangement groove 102, and a plurality of elastic connecting ropes 7 pass through the elastic hoses 8 respectively. Only one elastic connecting rope 7 passes through one of the elastic hoses 8, and the elastic hoses 8 are fixed to the plate body 101 or to each other through the bracket, so as to avoid the scattered elastic connecting ropes 7 from being entangled together, and it is not easy to affect the dragging of the power end 1 4 and the power end 2 6, and it is not easy to affect the demonstration effect.

[0047] The adsorption end 1 3 and the power end 1 4 or the adsorption end 2 5 and the power end 2 6 connected to the same elastic connecting rope 7 are printed with the same color, while the adsorption end 1 3 and the power end 1 4 or the adsorption end 2 5 and the power end 2 6 connected to different elastic connecting ropes 7 are printed with different colors. The dragging target of the power end 1 4 or the power end 2 6 is determined to facilitate the demonstration operation.

[0048] See also Figure 4 The sealing strip 9 includes a rubber strip 901 , and finger grooves 902 are chiseled at four outer corners of the rubber strip 901 , which facilitates the disassembly of the sealing strip 9 and the maintenance and replacement of the structure in the layout groove 102 by the user.

[0049] The second implementation method:

[0050] Figure 9-10 The adsorption end 3 shown, wherein the adsorption end 3, the power end 4, the adsorption end 5 and the power end 6 are of the same structure, and only the adsorption end 3 is taken as an example here, the adsorption end 3 includes an adsorption magnetic block 301, the adsorption magnetic block 301 is inserted into the through hole, and a rotation groove 302 is drilled at one end of the adsorption magnetic block 301 close to the layout groove 102, and a connecting rod 303 is inserted in the rotating groove 302, and a sealing ring 305 matching the rotating groove 302 is fixedly connected to the opening of the rotating groove 302, and the sealing ring 305 is sleeved on the outside of the connecting rod 303, one end of the elastic connecting rope 7 is fixedly connected to the connecting rod 303, and the redundant elastic connecting rope 7 is wound around the connecting rod 303, when the elastic connecting rope 7 is pulled, the connecting rod 303 can replace the adsorption end 3 to rotate as a whole, thereby increasing the stability of the demonstration board 1 during the demonstration.

[0051] In particular, in the present application, the adsorption magnetic block 301 is demonstrated in the form of a column, and can also be designed as a plate shape and a clamp shape to further increase the stability of the connection between the adsorption magnetic block 301 and the clip 2. This is a well-known technology for those skilled in the art, so it is not disclosed in detail in the present application.

[0052] The end of the connecting rod 303 away from the adsorption magnetic block 301 is fixedly connected to an anti-slip plate 304, and the outer wall of the anti-slip plate 304 close to the adsorption magnetic block 301 is chamfered. The existence of the anti-slip plate 304 can prevent the elastic connecting cable 7 from directly detaching from the adsorption end 3. On the other hand, the chamfer can reduce the wear of the elastic connecting cable 7 and the anti-slip plate 304, making the elastic connecting cable 7 not easy to break.

[0053] Compared with the first embodiment, the present embodiment discloses a specific structure of the adsorption end 3. On the one hand, a connecting rod 303 is utilized to replace the rotation of the adsorption end 3 when the elastic connecting rope 7 is pulled, thereby increasing the stability of the demonstration board 1 during the demonstration. On the other hand, the anti-slip plate 304 also effectively protects the elastic connecting rope 7, and while preventing the elastic connecting rope 7 from falling off as a whole, it also reduces the wear rate of the elastic connecting rope 7, making it easy to maintain the normal progress of the demonstration.

[0054] The third implementation method:

[0055] See also Fig.11 , the genetic material also includes a pair of semicircular magnets 10, a pair of fixed rods 11 and a plurality of combined units 12, the two semicircular magnets 10 are adsorbed, and the adsorption forces between the semicircular magnet 10 and the adsorption end 1 3 and between the semicircular magnet 10 and the adsorption end 2 5 are greater than the adsorption forces of two adjacent semicircular magnets 10, one end of the two semicircular magnets 10 away from each other is fixedly connected with a pair of fixed rods 11, and the plurality of combined units 12 are connected end to end to form four groups of complexes, and the four groups of complexes are respectively sleeved on one end of the four fixed rods 11 away from the semicircular magnets 10. In this embodiment, the two semicircular magnets 10 constitute the centromere, and the two groups of fixed rods 11 and the combined unit 12 connected to one semicircular magnet 10 constitute the chromatid;

[0056] See also Figure 12-13 The combined unit 12 includes a shell 1201 and a connecting portion 1202. A cavity matching the size of the connecting portion 1202 is formed at one end of the shell 1201 away from the connecting portion 1202. A magnetic ring 1203 is fixedly connected in the cavity, and the magnetic ring 1203 is adsorbed on the connecting portion 1202. Two adjacent combined units 12 are fixedly connected through the connecting portion 1202 and the magnetic ring 1203. A separation pin 1206 is inserted in the cavity, and the magnetic ring 1203 is sleeved on the outside of the separation pin 1206, a tension spring 1207 is fixed between the separation pin 1206 and the bottom plate of the cavity groove, the cavity side wall is fixedly connected to an extrusion ball 1204 that matches the position of the separation pin 1206, and a positioning groove 1205 that matches the extrusion ball 1204 is drilled on the outer wall of the shell 1201. The shell 1201 is an elastic structure at the location where the positioning groove 1205 is drilled, and the shell 1201 is made of hard material at the location where the non-positioning groove 1205 is drilled.

[0057] In this embodiment, the semicircular magnet 10, the fixing rod 11 and the combination unit 12 are used to replace the clip 2 as the chromosome. During the display process, the combination unit 12 on the adjacent chromosome can realize the process of exchanging genetic material on the chromosome: please refer to Fig.14When the combined unit 12 needs to be replaced, the positioning groove 1205 of the combined unit 12 to be replaced is pinched to push out the separation pin 1206, so that the connecting part 1202 and the magnetic ring 1203 of the two adjacent combined units 12 are separated, reducing the magnetic attraction of the two, which is convenient for the operator to separate the two adjacent combined units 12. After the separation of the combined units 12 is completed, the positioning groove 1205 is released, and the separation pin 1206 returns to the initial position under the pull of the tension spring 1207, which is convenient for the assembly and disassembly of the adjacent combined units 12, and the operator is convenient to quickly replace the combined unit 12, intuitively demonstrating the process of replacing the genetic material of the chromosome, and when showing the process of meiosis, the semicircular magnet 10 is pulled by the adsorption end 1 3 and the adsorption end 2 5 to pull the chromosome to move.

[0058] The shell 1201 is made of silicone and has different colors. The shell 1201 installed in the initial state of the connected semicircular magnets 10 (the state before the exchange of genetic material) is the same color. When the chromosomes exchange genetic material, the demonstration will be more obvious.

[0059] In view of current practical needs, the above-mentioned implementation mode adopted in this application is not limited to the scope of protection. Various changes made within the knowledge scope of technical personnel in this field without departing from the concept of this application still fall within the scope of protection of the present invention.

Claims

1. A meiosis teaching demonstration model, characterized in that: The demonstration board (1) comprises a board body (101), wherein genetic material is placed in the board body (101), wherein the genetic material is composed of a plurality of clips (2), wherein a layout groove (102) is bored at the upper end of the board body (101), and a plurality of through holes are bored on the side wall of the board body (101), wherein a first adsorption end (3), a first power end (4), a second adsorption end (5) and a second power end (6) which match the board body (101) are respectively plugged into the plurality of through holes, wherein the first adsorption end (3), the first power end (4), the second adsorption end (5) and the second power end (6) are all made of magnetic materials, and the first adsorption end (3), the first power end (4), the second adsorption end (5) and the second power end (6) are respectively plugged into the plurality of through holes according to the installation positions of the first adsorption end (3), the first power end (4), the second adsorption end (5) and the second power end (6). 3), the power end 1 (4), the adsorption end 2 (5) and the power end 2 (6) are divided into two groups, the two groups of the adsorption end 1 (3) and the power end 2 (6) are respectively distributed on the opposite side walls of the plate body (101), and the power end 2 (6) located on the same side wall is evenly distributed on both sides of the adsorption end 1 (3), the two groups of the power end 1 (4) and the adsorption end 2 (5) are respectively distributed on the other opposite side walls of the plate body (101), and the adsorption end 2 (5) located on the same side wall is evenly distributed on both sides of the power end 1 (4), a plurality of the adsorption ends 1 (3) and the adsorption ends 2 (5) are respectively adsorbed on the clamp (2), a plurality of power ends 1 (4) at matching positions are adsorbed on each other, and a plurality of power ends 2 (6) at matching positions are adsorbed on each other; An elastic connection rope (7) is fixedly connected between the adsorption end 1 (3) and the adjacent power end 1 (4), and an elastic connection rope (7) is fixedly connected between the power end 2 (6) and the adjacent pair of adsorption ends 2 (5). Before the power end 1 (4) and the power end 2 (6) are installed and inserted into the through hole, the redundant elastic connection rope (7) is respectively wound around the power end 1 (4) and the power end 2 (6). The elastic connection rope (7) is arranged in a laying groove (102), and a sealing strip (9) matching the laying groove (102) is fixedly embedded at the upper opening of the laying groove (102).

2. A meiosis teaching demonstration model according to claim 1, characterized in that: The surface of the demonstration board (1) is coated with a magnetic coating, and the adsorption force between the demonstration board (1) and the clip (2) is smaller than the adsorption force between the clip (2) and the first adsorption end (3) and the second adsorption end (5).

3. A meiosis teaching demonstration model according to claim 1, characterized in that: A plurality of groups of elastic hoses (8) are arranged in the arrangement groove (102), and a plurality of the elastic connecting ropes (7) pass through the elastic hoses (8) respectively.

4. A meiosis teaching demonstration model according to claim 1, characterized in that: The adsorption end 1 (3) and the power end 1 (4) or the adsorption end 2 (5) and the power end 2 (6) connected to the same elastic connecting rope (7) are printed with the same color, while the adsorption end 1 (3) and the power end 1 (4) or the adsorption end 2 (5) and the power end 2 (6) connected to different elastic connecting ropes (7) are printed with different colors.

5. A meiosis teaching demonstration model according to claim 1, characterized in that: The sealing strip (9) comprises a rubber strip (901), and finger grooves (902) are chiseled at four outer corners of the rubber strip (901).

6. A meiosis teaching demonstration model according to claim 1, characterized in that: The adsorption end (3) comprises an adsorption magnetic block (301), the adsorption magnetic block (301) is inserted into the through hole, a rotation groove (302) is formed at one end of the adsorption magnetic block (301) close to the layout groove (102), a connecting rod (303) is inserted into the rotation groove (302), a sealing ring (305) matching the rotation groove (302) is fixedly connected to the opening of the rotation groove (302), and the sealing ring (305) is sleeved on the outer side of the connecting rod (303), one end of the elastic connecting rope (7) is fixedly connected to the connecting rod (303), and the redundant elastic connecting rope (7) is wound around the connecting rod (303).

7. A meiosis teaching demonstration model according to claim 6, characterized in that: An end of the connecting rod (303) away from the adsorption magnetic block (301) is fixedly connected to an anti-slip plate (304), and a chamfer is provided on the outer wall of the anti-slip plate (304) on the side close to the adsorption magnetic block (301).

8. A meiosis teaching demonstration model according to claim 1, characterized in that: The genetic material further comprises a pair of semicircular magnets (10), a pair of fixing rods (11) and a plurality of combination units (12); the two semicircular magnets (10) are attracted to each other, and the attraction forces between the semicircular magnet (10) and the first attraction end (3) and between the semicircular magnet (10) and the second attraction end (5) are both greater than the attraction forces between two adjacent semicircular magnets (10); one end of the two semicircular magnets (10) away from each other is fixedly connected with a pair of fixing rods (11); the plurality of combination units (12) are connected end to end to form four groups of complex bodies, and the four groups of complex bodies are respectively sleeved on one end of the four fixing rods (11) away from the semicircular magnets (10); The combined unit (12) comprises a shell (1201) and a connecting portion (1202); a cavity matching the size of the connecting portion (1202) is bored at one end of the shell (1201) away from the connecting portion (1202); a magnetic ring (1203) is fixedly connected in the cavity, and the magnetic ring (1203) and the connecting portion (1202) are attracted to each other; two adjacent combined units (12) are fixedly connected via the connecting portion (1202) and the magnetic ring (1203); a separation pin (1206) is inserted in the cavity, and the magnetic ring (1203) is fixedly connected to the connecting portion (1202) and the magnetic ring (1203); 1203) is sleeved on the outside of the separation pin (1206), a tension spring (1207) is fixed between the separation pin (1206) and the bottom plate of the cavity groove, the side wall of the cavity is fixedly connected with an extrusion ball (1204) matching the position of the separation pin (1206), and a positioning groove (1205) matching the extrusion ball (1204) is chiseled on the outer wall of the shell (1201), the shell (1201) is an elastic structure at the location where the positioning groove (1205) is chiseled, and the shell (1201) is made of hard material at the location where the non-positioning groove (1205) is chiseled.

9. A meiosis teaching demonstration model according to claim 8, characterized in that: The shell (1201) is made of silicone and has different colors. The shell (1201) installed in the initial state of the connected semicircular magnets (10) is of the same color.

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