Human Heredity 11th Edition by Michael Cummings

Exercise 31

Consider another cross in pea plants involving the genes for pea color and shape. As before, yellow is dominant to green and smooth is dominant to wrinkled. A plant with smooth yellow peas is crossed to a plant with wrinkled green peas. The peas produced by the offspring are as follows: one-fourth are smooth yellow; one-fourth are smooth green; one-fourth are wrinkled yellow; and one-fourth are wrinkled green.
A) What is the genotype of the smooth yellow parent?
B) What are the genotypes of the four classes of offspring?