Comb Shape in Chickens Represents One of the Classic Examples

question 56

Multiple Choice

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

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