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random changes in the frequency of alleles in a gene pool, usually of small populations.

genetic drift n.
Random fluctuations in the frequency of the appearance of a gene in a small isolated population, presumably owing to chance rather than natural selection. Also called drift.
genetic drift
Fluctuations in the frequency of a gene in a small isolated population, thought to be due to random chance rather than natural selection.

A term that describes the random fluctuations in a gene pool over time. In large populations, the effects of genetic drift are negligible. (Compare natural selection.)


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