Gray seed color in peas is dominant to white. Assume that Mendel conducted a series of experiments where plants with gray seeds were crossed among themselves, and the following progeny were produced: 302 gray and 98 white. What is the most probable genotype of each parent?
A) GG × gg
B) Gg × Gg
C) GG × Gg
D) gg × Gg

Question

Quizplus · Accepted Answer

Since gray seed color is dominant and there are 302 gray progeny, we know that at least one parent must be heterozygous for the gray seed color gene (Gg). If both parents were homozygous dominant (GG), then all progeny would be gray. If one parent was homozygous recessive (gg), then all progeny would be white. Thus, the only option that fits is that both parents are heterozygous (Gg), which would result in a 3:1 ratio of gray to white progeny.

Gray Seed Color in Peas Is Dominant to White