A Cross Between a Rose Comb Chicken (RRpp) and a Pea

question 82

Multiple Choice

A cross between a rose comb chicken (RRpp) and a pea comb chicken (rrPP) produces all walnut comb chickens (RrPp) .This outcome is a result of

• A)environmental factors.
• B)two interacting gene pairs affecting one trait.
• C)a gene mutation in the rose comb chicken.
• D)pleiotropic effects of the P gene product.
• E)continuous variation in phenotypes.

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