Genetics: Analysis and Principles 5th Edition by Robert Brooker

Exercise 52

In the clover butterfly, males are always yellow, but females can be yellow or white. In females, white is a dominant allele. Two yellow butterflies were crossed to yield an F 1 generation consisting of 50% yellow males, 25% yellow females, and 25% white females. Describe how this trait is inherited and specify the genotypes of the parents.