Comb shape in chickens is determined by genes at two loci (R, r and P, p) that independently assort. A single comb (A) is produced if two recessive genes are present at the first and the second locus (rr pp). A rose comb (B) is produced when at least one dominant gene is present at the first locus and two recessive genes are present at the second locus (genotype R_ pp). A pea comb (C) is produced when two recessive genes are present at the first locus and at least one dominant gene is present at the second (genotype rr P_). A walnut comb (D) is produced when at least one dominant allele R is present at one locus and at least one dominant allele P is present at a second locus (genotype R_ P_). Determine the phenotypic ratios of the progeny from the following matings. (2 pts each) (a) rr PP x RR pp (b) Rr Pp x rr pp (c) Rr Pp x Rr Pp b. The expression of ABO antigens depends on alleles at the H locus. A dominant allele (H) at the H locus encodes an enzyme that makes compound H, which is needed to produce ABO antigens. The recessive allele (h) encodes a defective enzyme that is incapable of making compound H. Based on this information and the ABO phenotypes, determine the ABO and H genotypes for each of the six members of this extended family. Use “?” for any alleles that cannot be determined. (6 pts, 1 pt per two-loci genotype) Man: Woman: Man’s mother: Man’s father: Daughter: Son: : c. Of the two loci for ABO and H, which is epistatic and what type of epistasis occurs? Explain the epistasis. (3 pts: 1pt epi locus, 2pts epistasis type and explanation)