An educational model that demonstrates cell division

Abstract

A teaching model for demonstrating cell division is composed of a flexible transparent chromosome magnetic model, a homologous chromosome cross exchange model, and a cell division telescopic rope model. The flexible transparent chromosome magnetic model is used for demonstrating the behavior relationship of chromosome, chromatid, DNA and gene in the processes of mitosis and meiosis, demonstrating the relationship between meiosis and the basic genetic laws and demonstrating the chromosome number and structure variation. The homologous chromosome cross exchange model is used for demonstrating cross exchange in the tetrad stage of meiosis. The cell division telescopic rope model is used for demonstrating depression and hanging division in the middle of cytomembrane in the process of animal cell division and demonstrating a dynamic change process in which a cell plate is extended to a cell wall and one cell is divided into two cells in the late stage of plant cell separation.

Description

technical field [0001] The invention belongs to the field of biological teaching models, in particular, it can demonstrate the morphological structure and dynamic changes of chromosomes in the process of mitosis and meiosis, demonstrate the behavioral relationship between chromosomes and (DNA) genes, illustrate the relationship between meiosis and genetic laws, and demonstrate cell A dynamic teaching model of cell membrane and nucleus constriction in the end stage of cytoplasmic division and amitosis. Background technique [0002] In teaching, during mitosis and meiosis of cells, the morphological structure and behavior changes of chromosomes, the relationship between chromosomes and chromatids, the relationship between chromosomes and DNA quantity, and the relationship between meiosis and the basic laws of inheritance are important and difficult contents in teaching . According to relevant information, the existing chromosome models and cell division (including mitosis and...

AI Technical Summary

Problems solved by technology

[0003] 1. Most of the existing chromosome structure models are made of hard materials such as thin iron wires, plastic chips, wood chips, and clay, which lack flexibility. This is inconsistent with the flexibility of chromosomes in living cells. Hard materials Chromosomes cannot vividly demonstrate the dynamic changes of chromosomes with the centromere at the front and the chromosome arms at the rear under the traction of the spindle, and many chromosome models cannot be repeated and used for a long time;

[0004] 2. The existing chromosome structure model cannot demonstrate the phenomenon of genetic recombination caused by crossover and exchange between non-sister chromatids of homologous chromosomes in the tetrad stage of meiosis; the existing chromosome model fails to clearly show chromosomes, DNA The parallel relationship with genes, so it is difficult to demonstrate the relationship between meiosis and the three major laws of inheritance;

[0005] 3. The existing cell division models focus on demonstrating the changes in the chromosomes in the nucleus during the cell division process. For animal cells in the late stage of cell division, the cell is constricted and split into two cells due to the depression in the middle of the cell membrane, and the cell plate expands near the equatorial plate at the end of plant cell division. Demonstration models for new cell walls have not been reported;

[0006] 4. The existing cell division models are generally used as teaching aids for teachers. Due to the limited configuration, they cannot meet the needs of all students for autonomy, cooperation, and inquiry learning. They cannot fully reflect the teaching concept of taking students as the main body, and are not conducive to students' core scientific literacy in biology. and the cultivation of innovative spirit and practical ability

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