31 results about "Genetic composition" patented technology

The present invention relates to methods to control the spread of recombinant DNA molecules between sexually compatible plants of differing genetic composition. The invention describes the production of transgenic plants that comprise recombinant traits of interest or concern linked to repressible lethal genes. The lethal genes are blocked by the action of repressor molecules produced by the expression of repressor genes located at a different genetic locus. The lethal phenotype is only expressed after the segregation of the repressible lethal gene construct and the repressor gene following meiosis. The present invention may be employed for both open-pollinated and hybrid seed production systems and may be used to maintain genetic purity by blocking unintended introgression of genes from plants devoid of the specific repressor gene. The invention includes methods that impart traits that are desirable for environmentally responsible heterologous protein production, to genetic material used to impart said traits and to new plants and products derived by said methods.

The invention discloses a method for drawing a genetic composition map of a wheat variety, and relates to the technical field of agricultural science and technology and molecular markers. According to the method, tens of thousands and hundreds of thousands of SNP markers are obtained by analysis of high-throughput wheat chips (such as 660K and 90K chips and the like), genetic information transmission and distribution of wheat breeding parents and offsprings having clear genealogical relationship are displayed in the form of images so as to achieve the visual display of the distribution pattern including number and distribution in chromosomes of the genetic information of the parents in genomes of offsprings, wherein according to the number, general genetic information transmission can be seen by the genetic composition map, when male and female parents are large in contribution difference, the quantity of the genetic information contributed by the male or female parents can be more clearly to see. The method facilitates better understanding of the effect of wheat breeding on the genomes from genome level, and the genomic information is provided to subsequent wheat breeding for reference.

The invention provides a new insect genetical population simulating method based on natural reproduction process. In the method, a primary sample sequence marked by an insect parent molecule is utilized as the genetic composition of a parent, number vectors consisting of 1 and 0 are used for representing the genetic markers of chromosomes and gametes, and the genetic distance between the genetic markers is converted into recombination frequency by a mapping function. When F1 half-bred by two parents generates a gamete, the exchange process of reduction division is simulated by simple samplings which are uniformly and randomly distributed; and individual inspect is simulated by repeated gamete sampling and zygote forming, so that a genetic group is formed. The method can be used for the exploration and the evaluation on an insect gene mapping method, and the dynamic change of the insect resistance genes in generations can be researched through the genetic markers, without years of multipoint practical field tests, so that the efficiency of genetic research is improved greatly. The new insect genetical population simulating method is applied to crop production and pest prevention management and has very good positive results.

A breeding method for the new variety of the carp relates to a breeding method of a new variety of the fish, which resolves the problems of the prior group breeding method for the culture and the cultivation of the carp that is easy to have the inbreeding, which leads to the decrease of the economic character and the production performance; the intraspecific hybridization method has great randomness, the probability for breeding an excellent variety is low and is easy to have the inbreeding. The breeding procedures are: 1. performing the phenotypic character selection; 2. detecting the genetic information of the parent strain; 3. performing the reproduction grouping according to the genetic information; 4. cultivating the filial generation to be matured; 5. adopting the offspring carp as the new generation of the breeding parent strain and repeating the operation procedures from 1 to 4 until the carp meets the character design requirements of the new variety. The present invention always uses the molecular marker to detect the genetic composition of the parent strain and the filial generation in the selection process of the new carp variety, thereby avoiding the inbreeding; moreover the character of the new variety of the carp is developed in the designed direction, the emergence probability of the excellent new variety is high; therefore, the economic character and the production performance of the carps are obviously improved.