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случайное распространение генетических мутаций в популяции

Along with natural selection, a key evolutionary process, whereby the frequency of certain genes (alleles, actually) varies randomly in a given population rather than being "pushed" by natural selection. Think about a population of rats in which all but one have striped tails. A catastrophe kills all but the one, who goes on to breed. Result: a majority with unstriped tails.

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