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31 May, 06:42

Concerning comb shape in chickens, which of the following is true? Multiple Choice

The R gene is dominant to the P gene.

The R and P must both be present to produce a walnut comb.

R is recessive to r and produces a rose comb.

P is recessive to p and produces a single comb.

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  1. 31 May, 08:56
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    The R and P must both be present to produce a walnut comb.

    Explanation:

    Comb shape in chickens is an example of intergenic interaction. Two genes R and P come together to determine the type of comb.

    If R is present in dominant form and p in recessive form (R_pp) : Rose comb If P is present in dominant form and r in recessive form (rrP_) : Pea comb If both R and P are present in dominant form (R_P_) : Walnut comb If both r and p are present in recessive form (rrpp) : Single comb

    Hence, it is clear that both R and P must be present to produce a walnut comb.
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