Genetic drift is most powerful as an evolutionary cause when operating on small populations.

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Genetic drift is a random process that can lead to changes in allele frequencies in a population. It is most likely to occur and have the most significant effects on small populations, where chance events can have a more significant impact on the gene pool. In larger populations, genetic drift is less potent as the effects of random events are diluted.

Genetic Drift Is Most Powerful as an Evolutionary Cause When