Question 1
What is the consequence of natural selection favoring the heterozygous genotype (as exhibited by the sickle cell allele in malaria-prone regions), in which alleles reach stable equilibrium frequencies that are maintained by the ongoing action of selection against the homozygous genotypes?
Question 2
What type of geographic separation resulted in diversification of an ancestral species of ground squirrel into two species,
Ammospermophilus leucurus, found on the north rim of the Grand Canyon, and members of the
Ammospermophilus harrisii on the south rim of the canyon?