Aresearcher is studying a newly discovered gene that causes increased body weight in domesticated chickens. in a mainland population, the frequency of the a1 allele is 0.2, for this gene with two alleles. if 100 of these mainland chicken are transported on a ship to an isolated island with a population of 200 a1a1 chickens, 400 a1a2 chickens, and 400 a2a2 chickens, what would the frequency of the a1 allele in the admixed population?