What role does hereditary variation play in nature?

Hereditary variation is the driving force of evolution, which leads to the diversity of genotypes in nature. For example, the divergence of attributes is the basis of the evolutionary process. Any species consists of a large number of populations that differ in a number of ways. But the population does not happen to be homogeneous either: due to mutational variability, there are individuals more and less adapted to the conditions of existence. In populations, recessive mutations that do not manifest themselves phenotypically are constantly accumulating. When the conditions of existence change, the discrepancy of signs begins. This lies in the fact that individuals with extreme manifestations of any trait will mainly survive or die out without leaving offspring. The group of individuals that is best suited to new conditions will actively multiply, passing on useful hereditary traits from generation to generation. The least adapted individuals will quickly die out, and individuals with an intermediate value of the trait will gradually be replaced by more adapted ones. Thus, new subspecies and species arise.

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