Reference no: EM132174873

Earl has normal color vision, while his wife Erma is colorblind. Colorblindness is an X-linked trait, and the normal allele is dominant to the colorblindness allele. If they have a large family, in what ways should the colorblindness trait affect their children?

In cats, there is a coat color gene located on the X chromosome. This gene has two alleles-orange and black. A heterozygous cat has tortoiseshell color (a splotchy mixture of orange and black). Predict the genotypic and phenotypic frequencies among the offspring of the following crosses. Pay careful attention to the genders of the offspring.

a. Black female X Orange male

b. Orange female X Black male

c. Tortoiseshell female X Black male

d. Tortoiseshell female X Orange male