Comb shape in chickens represents one of the classic examples of gene interaction.Two gene pairs interact to influence the shape of the comb.The genes for rose comb R and pea comb P together produce walnut comb.The fully homozygous recessive condition rrppproduces the single comb.Assume that a rose- comb chicken is crossed with a walnut- comb chicken and the following offspring are produced: 17 walnut,16 rose,7 pea,and 6 single.What are the probable genotypes of the parents? A)RrPp × RRPP B)rrpp × RrPp C)Rrpp × RrPp D)rrPP × RRpp E)RRPP × Rrpp

Question

Quizplus · Accepted Answer

The offspring produced in the cross suggest that both parents are heterozygous for both gene pairs, as they produced all four possible comb shapes in their offspring. Therefore, the most probable genotype for the rose-comb parent is RrPp, and the most probable genotype for the walnut-comb parent is Rrpp. A cross between these genotypes can produce offspring with all four possible comb shapes, as observed in the given offspring.

Comb Shape in Chickens Represents One of the Classic Examples