The role of natural selection in biological evolution, reflecting modern biological concepts, is presented systematically. A new approach to the theoretical generalization and mathematical description of this key problem of biology, based on ideas about the physical phenomenon of "flow", has been proposed and developed. The natural selection of optimal variants in the evolutionary mutation flow is considered as a percolation filter - a physical tool that makes up the selection mechanism. It is shown that in the absence of drift, the process of fixing mutations is determined only by determined selection mechanisms, i.e. the presence of supporting and prohibiting mutations in the population and their interaction with new mutations.
estestvennyy otbor, samoorganizaciya, fluktuacii, bifurkacii, perkolyacii, mutacii
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