The red kernel color in wheat is caused by the presence of at least one dominant allele in each of two independently segregating gene pairs (e.g., R_B_). Wheat plants with rrbb genotypes have white kernels, and plants with genotypes R_bb and rrB_ have yellow kernels. You cross a plant homozygous for red kernels (RR BB) with a plant homozygous for white kernels. What are the relative proportions of the phenotypic classes expected in the F₂ progeny after selfing the F₁ progeny? A) 9 red; 3 white; 4 yellow B) 9 red; 6 yellow; 1 white C) 9 yellow; 4 red; 1 white D) 9 red; 3 yellow; 4 white E) 12 red; 3 yellow; 1 white

Question

Quizplus · Accepted Answer

The F1 progeny will all be heterozygous (Rr Bb) and have red kernels. In the F2 generation, the phenotypic ratio expected is 9 red (R_B_), 6 yellow (R_bb and rrB_), and 1 white (rrbb).

The Red Kernel Color in Wheat Is Caused by the Presence