Chapter 3, Problem 32P

Red $\text{-}$ green color blindness in humans is inherited as an X $\text{-}$ linked recessive condition. Consider reciprocal crosses between a color $\text{-}$ blind parent and a parent with normal color vision in which the dominant allele is identified as C and the recessive allele as c. Cross $\text{1}$ is $\text{Cc × cY}$, and Cross $\text{2}$ is $\text{cc × CY}$. Determine the phenotypes and their proportions in progeny produced by each cross. Explain why the reciprocal cross results are consistent with an X $\text{-}$ linked recessive inheritance but not with an autosomal recessive inheritance of color blindness.