Mendel crossed true-breeding plants that had yellow peas with plants that had green peas. The resulting plants all had yellow peas. An F₁ cross resulted in three-quarters of the plants having yellow peas and one-quarter of the plants having green peas. What does this tell you about the alleles for colour?

Question

Quizplus · Accepted Answer

Yellow being the dominant color is indicated by all the first-generation plants having yellow peas despite one parent having green peas. The 3:1 ratio in the F2 generation further supports the dominance of yellow, as this is the expected ratio for a monohybrid cross involving dominant and recessive traits.

Mendel Crossed True-Breeding Plants That Had Yellow Peas with Plants