Question: Comb shape in chickens represents a classic example of gene interaction. Two gene pairs interact to influence the shape of the comb. The genes for rose com (R) and pea comb (P) together produce walnut comb. The fully homozygous recessive condition (rrpp) produce the single comb. A rose comb chicken is crossed with a walnut comb chicken. and the following offspring are produced: 17 walnut, 16 rose, 7 pea, 6 single.

1) what are the probable genotypes of parents?

2) give the genotypes of each of the pffspring classes