In a certain breed of chicken, an incomplete dominant gene controls color. The homozygous black (BB), when crossed

with the homozygous splashed-white (bb), produces an intermediate gray color pattern referred to as blue. A second gene
controls the shape of the comb. The dominant allele (R) produces rose, whereas the recessive allele (r) produces single.
Give the F1 and F2 genotypic and phenotypic ratios of a cross between a true-breeding black with a single comb and a
true-breeding splashed-white with a rose comb. What will be an ideal response?


ANSWER: F1: Bb Rr blue rose; F2: 3 BB R__ black rose, 6 Bb R__ blue rose, 3 bb R__ splashed-white
rose, 1 BB rr black single, 2 Bb rr blue single, 1 bb rr splashed-white single

Biology & Microbiology

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