Round seeds (R) are dominant to wrinkled seeds (r) , and yellow seeds (Y) are dominant to green seeds (y) . A true-breeding pea plant with round and yellow seeds is crossed to a true-breeding plant with wrinkled and green seeds.
-The F₁ progeny are allowed to self-fertilize. What is the probability of obtaining a yellow seed in the F₂?

Question

Quizplus · Accepted Answer

The F1 generation will be all heterozygous for both genes (RrYy). When the F1 plants self-fertilize, the F2 generation will have a 9:3:3:1 ratio of phenotypes. The probability of obtaining a yellow seed in the F2 is 9/16 + 3/16 = 3/4.

Round Seeds (R) Are Dominant to Wrinkled Seeds (R), and Yellow