In pea plants, the gene for round seed (R) is dominant, and wrinkled seeds (r) are recessive. The endosperm of the pea is also either starchy, a dominant gene (S), or waxy (s). What can be said of a fully heterozygous, dihybrid cross?
A) It is impossible to secure offspring that are homozygous for both dominant genes.
B) It is impossible to secure offspring that are homozygous for both recessive genes.
C) It is impossible to secure offspring that are homozygous for one dominant gene such as round seed and homozygous recessive for the other recessive waxy gene.
D) All of these choices are impossible combinations in a dihybrid cross.
E) All of these choices are possible combinations in a dihybrid cross.

Question

Quizplus · Accepted Answer

In a dihybrid cross involving two heterozygous parents (RrSs x RrSs), all combinations of traits, including homozygous dominant (RRSS), homozygous recessive (rrss), and mixed homozygous dominant for one trait and homozygous recessive for the other (RRss or rrSS), are possible due to the independent assortment of alleles.

In Pea Plants, the Gene for Round Seed (R) Is