Question: Think about a population of one hundred mice on an island, with allele frequencies B=0.2 for black coat color and b=0.8 for white coat color. Black, B, is dominant to white, b, and the population is in HWE. 25 homozygous black mice from the mainland float to the island on an uprooted tree after a storm.
What are the allele frequencies on the island after the migration event?
What were the genotype frequencies before and after the migration event?
Is the population still in HWE after the migration event?
If not, how long will it take to get back into HWE if no more mice arrive, and if there are no other forces affecting allele frequencies?