Genetic heterogeneity and phenotypic individuality in the human population (message 2)

Abstract

Genetic heterogeneity in the human population is ensured by gametogenesis, which, through recombination of alleles, provides a fantastic number of gamete variants. Only one combination of this variety is realized in each descendant, alleles do not recombine in somatic cells of descendants, the combination of all 25 thousand pairs of alleles remains unchanged in ontogenesis, providing the phenotypic individuality of each individual person. People differ in variants of the same signs and variants of their combinations. In the human population there is only one qualitative feature provided by the genetic program, inherent only to female representatives - to bear and give birth to children. In both sexes, two types of signs should be distinguished: 1) signs that do not change during ontogenesis, that is, that do not depend on the influence of the environment; 2) signs capable of changing the strength of its manifestation during ontogenesis under the influence of environmental factors. The environment can not only change the genetic potential of the manifestation of the second variant of traits, but also pervert it.