26.In the peppered month (B ist on be ml aria), black individuals may be either homozygous (A1A1) or heterozygous (A1A2), whereas pale gray months are homozygous (A2A2). Suppose that in a sample of 250 months from one locality,108 are black and 142 are gray, (a) Which allele is dominant? (b) Assuming that the locus is in Hardy-Weinberg equilibrium, what are the allele irequencies? (c)Under this assumption, please describe Ho (Observed heterozygosity), He (Expect heterozygosity) and Fis. (6 分）