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Genetic drift(also known as allelic drift or the Sewall Wright effect) is the change in the frequency of an existing gene variant  (allele) in a population due to random sampling of organisms. The alleles in the offspring are a sample of those in the parents, and chance has a role in determining whether a given individual survives and reproduces

When there are few copies of an allele, the effect of genetic drift is larger, and when there are many copies the effect is smaller.



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