Genetic drift, or changes in allelic frequency due to chance factors, occurs in populations that are very ______.

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Genetic drift, or changes in allelic frequency due to chance factors, occurs in populations that are very small in number. Explanation: Genetic drift, the change in allele frequencies due to chance events, occurs most significantly in populations that are very small in number. In small populations, random events can have a larger impact on allele frequencies, potentially leading to the loss or fixation of alleles independent of natural selection. This is because chance plays a greater role when there are fewer individuals.

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