Consider a locus with two alleles in an island population, where all assumptions of the Hardy-Weinberg model are met except "no migration." The figure shows the change in the frequency of the A₁ allele over several generations. What can you say about the population that is the source of migrants to the island? A) The rate of migration in the source population is higher than in the island population. B) The source population has a higher frequency of the A₁ allele at generation zero than the island population. C) Selection on the A₁ allele is stronger in the island population than it is in the source population. D) The A₁ allele is under balancing selection in the source population.

Question

Quizplus · Accepted Answer

The frequency of the A₁ allele increases in the island population over several generations, indicating that it is being introduced into the population through migration. Since all other assumptions of the Hardy-Weinberg model are met, this suggests that the frequency of the A₁ allele must be higher in the source population than in the island population at generation zero. Therefore, choice B is the correct answer. The other choices can be ruled out because there is no evidence in the figure to support them.

Consider a Locus with Two Alleles in an Island Population