All three are mechanisms in the evolutionary process that have to do with alleles and/or gametes, but there are several significant differences. As with genetic drift, this is a misnomer, because it refers to flowing alleles, not genes. Natural Selection Biology Dictionary Genetic drift, gene flow, and natural selection may sound similar or even confusing to some. In these simulations, alleles drift to loss or fixation (frequency of 0.0 or 1.0) only in the smallest population.Effect of population size on genetic drift: Ten simulations each of random change in the frequency distribution of a single hypothetical allele over 50 generations for different sized populations first population size n=20, second population n=200, and third population n=2000. The third force of evolution is traditionally called gene flow. \): Genetic drift over time: Ten simulations of random genetic drift of a single given allele with an initial frequency distribution 0.5 measured over the course of 50 generations, repeated in three reproductively synchronous populations of different sizes. Gene flow counterbalances natural selection and genetic drift, reshuffles mutations among spatial locations and contributes to shaping the contemporary spatial patterns of biodiversity 1,2,3,4,5. In summary we can conclude that gene flow involves the transfer of genetic material between populations, increasing genetic diversity and facilitating.
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