Mendel crossed true-breeding plants having yellow peas with true-breeding plants having green peas. The resulting plants all had yellow peas. An F₁cross resulted in 3/4 of the plants having yellow peas and 1/4 of the plants having green peas. What does this tell you about the alleles for color? A) Yellow is usually the dominant color, but sometimes green can be dominant. B) Green is the dominant color. C) Yellow is the dominant color. D) Yellow is the recessive color. E) Yellow and green are codominant.

Question

Quizplus · Accepted Answer

Yellow being the dominant color is indicated by all first-generation offspring having yellow peas despite one parent having green peas. The 3:1 ratio in the second generation further supports this, showing the recessive green phenotype only when two recessive alleles are present.

Mendel Crossed True-Breeding Plants Having Yellow Peas with True-Breeding Plants