Genetic drift describes the evolution of a population due to chance
Allele frequencies of a population can shift over generations due to genetic drift, a process of evolution (sampling error).
A population's allele frequencies can shift from generation to generation owing to random events, which is known as genetic drift. In more precise terms, genetic drift is a change that results from "sampling error" while choosing the alleles for the following generation from the gene pool of the current generation. All populations experience genetic drift, but its consequences are sometimes more pronounced in small populations.
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