Genetic Drift | Vibepedia

Genetic drift is a fundamental evolutionary mechanism describing the random fluctuations in the frequency of existing gene variants, or alleles, within a population. Unlike natural selection, which favors traits beneficial for survival and reproduction, genetic drift operates purely by chance, meaning allele frequencies can change unpredictably from one generation to the next. This random process can lead to the loss of some alleles and the fixation of others, thereby reducing genetic variation within a population. Its impact is most pronounced in small populations, where random events can have a disproportionately large effect. The relative importance of genetic drift versus natural selection has been a subject of intense debate in evolutionary biology, particularly since the mid-20th century, with figures like [[ronald-fisher|Ronald Fisher]] and [[motoo-kimura|Motoo Kimura]] playing pivotal roles in shaping our understanding of these forces.