Genetic drift operates in

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(B) Genetic drift is the change in the frequency of an existing gene variant (allele) in a population due to random sampling of organisms.It occurs du

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Small isolated population

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(B) Genetic drift is the change in the frequency of an existing gene variant (allele) in a population due to random sampling of organisms.It occurs due to chance events rather than natural selection.In large populations,the effects of genetic drift are usually negligible because random fluctuations tend to cancel each other out.However,in small isolated populations,genetic drift can cause significant changes in allele frequencies,potentially leading to the loss of alleles or fixation of others over time.

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