In a Certain Breed of Chicken, an Incomplete Dominant Gene

question 46

Essay

In a certain breed of chicken, an incomplete dominant gene controls color.The homozygous black, when crossed with the homozygous splashed-white, 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 pure-breeding black single and a pure-breeding splashed-white rose.

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