Preservation of species and conditions of evolution

Distinction of two opposite directed the time processes is considered: preservations of species and evolutions. On the basis of Hardy - Weinberg law the analysis of the reasons of the species preservation is submitted. With the help of a Green’s function for a population it is shown that at mutational influence on a population there is a disappearance of a mutational influence result for 4 - 5 generations. Evolutionary process occurs at infringement of the Hardy - Weinberg law due to a dot mutation of the different sex descendants of one female individual. Conditions at which occurrence of a new species is possible are submitted.