Influencing factors of quantitative inheritance

Polygene inheritance refers to the number of phenotypic traits of organisms and humans determined by the co-location of many different genes, rather than the role of a single gene, showing the characteristics of change. Also called quantitative trait. When the polygenic character of each gene has little effect, it is called minor gene, but different modified genes are also called additive genes. Genes with polygenic traits are influenced by environmental factors in addition to accumulating secondary functions, so forming a trait is a combination of two factors, so this is called multifactorial inheritance.

Polygenic inheritance has three characteristics: ① Two individuals with extreme changes (purebred) cross, and the first generation is mostly intermediate child type, which has a certain range of changes and is an impact on the environment. ② Two intermediate progeny hybrids, most of which are descendants of progeny 2, have a wide range of variation, and progeny 1 can also be extreme individuals. This is because besides environmental factors, the combination of genes also plays a certain role. ③ Random mating groups vary widely, but the middle is close to a few people. Most individual, environmental and genetic factors play a role.