Although each of the following has a better chance of influencing gene frequencies in small populations than in large populations, which one most consistently requires a small population as a precondition for its occurrence?
Question: Although each of the following has a better chance of influencing gene frequencies in small populations than in large populations, which one most consistently requires a small population as a precondition for its occurrence?
The most consistent requirement for a small population as a precondition for its occurrence is genetic drift. Genetic drift is the random change in gene frequencies which occurs when chance events cause certain alleles to become more or less common in a population. It can only occur in small populations because the chance of certain alleles being lost or gained is higher than in a large population. In large populations, genetic drift is less likely to occur because the chance of an allele being lost or gained is very low.
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