Give the phenotypic results of a cross between a fully heterozygous walnut-combed rooster and a hen with alleles for single comb.

Answer: Hetorzygous walnut comb genotype: RrPp
Single comb: rrpp
If we cross multiply these genotypes, RrPp X rrpp, the resulting offspring are:
RrPp, rrpp, RrPp, rrpp
Phenotype:
RrPp- walnut comb (50%)
rrpp- single comb (50%)
Explanation: