One Population of a Species Has 25 Individuals, All with Genotype

One population of a species has 25 individuals, all with genotype AA; a second population of this species has 40 individuals, all with genotype aa. Assume that these populations live far apart but in similar environmental conditions. Based on this information, the observed genetic variation most likely resulted from ________.

A) genetic drift
B) gene flow
C) nonrandom mating
D) directional selection

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