"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