A single gene in horses determines coat (hide) color. Palomino(‘dove’) horses are heterozygous (Aa), while homozygous recessive(aa) are cremello, and homozygous dominant (AA) are chestnut. Ahorse rancher buys 80 palomino horses and 20 cremello horses andlets them breed free.
(a) What are frequencies of alleles and genotypes in THIS(parent) generation? Are all genotypes represented? Show yourcalculations. Is the population at this moment (i.e. in THISgeneration) in Hardy-Weinberg balance or not? Explain.
(b) What would be frequencies of alleles and genotypes in NEXT(children) generation if one assumes Hardy-Weinberg balance? (noselection, new mutation, migration, etc.) Show yourcalculations.
(c) Now assume (for the purpose of the problem) thatHardy-Weinberg balance is violated by selection against cremellohorses (which leave less offspring). Relative fitness of bothchestnut and palomino is WAA = WAa = 1.0, but relative fitness ofcremello, Waa = 0.8 (which means that selection coefficient s= -0.2). What are frequencies of alleles and genotypes in NEXTgeneration?
