A human population has a higher-than-usual percentage of individuals, with a genetic disease. The most likely explanation is

natural selection

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gene flow

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genetic drift

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all of these

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Solution

The correct option is C genetic drift
Genetic drift can be defined as the variation in the relative frequency of different genotypes in a small population, owing to the chance disappearance of particular genes as individuals die or do not reproduce. That is why the most likely explanation of a human population having a higher-than-usual percentage of individuals with a genetic disease could be genetic drift.
So, the correct answer is 'genetic drift'

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