In chickens, comb shape is determined by genes at two loci (R, r and P, p).A walnut comb is produced when at least one dominant gene R is present at one locus and at least one dominant gene P is present at a second locus (genotype R_ P_).A rose comb 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 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_).If two recessive genes are present at the first and the second locus (rr pp), a single comb is produced.Give genotypes for comb shape of the parents in the following cross: rose crossed with single produces 31 rose offspring.

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The Answer of In chickens, comb shape is determined by genes at two loci (R, r and P, p).A walnut comb is produced when at least one dominant gene R is present at one locus and at least one dominant gene P is present at a second locus (genotype R_ P_).A rose comb 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 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_).If two recessive genes are present at the first and the second locus (rr pp), a single comb is produced.Give genotypes for comb shape of the parents in the following cross: rose crossed with single produces 31 rose offspring.

In Chickens, Comb Shape Is Determined by Genes at Two