There are 25 individuals in population 1,all with genotype AA,and there are 40 individuals in population 2,all with genotype aa.Assume these populations are located far from each other and that their environmental conditions are very similar.Based on the information given here,the observed genetic variation most likely resulted from
A)genetic drift.
B)gene flow.
C)nonrandom mating.
D)directional selection.

Question

Quizplus · Accepted Answer

The observed genetic variation is most likely caused by genetic drift, which is the random fluctuation of allele frequencies due to chance events. In this case, the populations are small (25 and 40 individuals) and isolated from each other, so chance events can have a significant impact on allele frequencies. Gene flow (choice B) is unlikely since the populations are far from each other, and nonrandom mating (choice C) and directional selection (choice D) are not supported by the given information.

There Are 25 Individuals in Population 1,all with Genotype AA,and