In a Certain Breed of Chicken, an Incompletely Dominant Gene

question 37

Short Answer

In a certain breed of chicken, an incompletely dominant gene controls color. The homozygous black, when crossed with the homozygous splashed-white, produces an intermediate gray color pattern called blue. A second gene controls the shape of the comb. The dominant allele ( R ) produces rose, while the recessive allele ( r ) produces single. Give the F ₁ and F ₂ genotypic and phenotypic ratios of a cross between a pure-breeding, black single and a pure-breeding, splashed-white rose.