You are studying an idealized population that meets all the

You are studying an idealized population that meets all the assumptions of the Hardy-Weinberg null model. You focus on a locus with two alleles: B_1, and B_2. The starting allele frequencies in the gene pool are 0.65 for B_1, and 0.35 for B_2. What will the genotypic frequencies be in the zygotes produced from this gene pool? If there are a total of 200 zygotes produced, how many will there be of each genotype? Assume that all of these zygotes live to maturity and reproduce. From these 200 individuals, what will the allele frequencies be going into the next generation?

Solution

allele frequencies 0.65 = B1 0.35 = B2 p +q = 1 0.65+0.35 =1 genotype frequencies p2+2pq+q2 (0.65)2 +2(0.65)(0.35) +(0.35)2 0.4225+0.455+0.1225 =1 p2 or B1B1 = 0.4225 or 42.25% 2pq or B1B2 = 0.455 or 45.5% q2 or B2B2 = 0.1225 or 12.25% Total 200 zygotes produced B1B1 = 0.4225 or 42.25% .........per 100 42.25 zygotes, per 200....84.5 B1B2 = 0.455 or 45.5%.........per 200.............91 B2B2 = 0.1225 or 12.25%..............per 200..............24.5 allele frequency for next generation for 200 individuals p = 0.65 q = 0.35