Monohybrid Cross Problem Set

Problem 6: Predicting the dominant allele

When true-breeding tall stem pea plants are crossed with true-breeding short stem pea plants, all of the ________ plants, and 3/4 of the __________ plants had tall stems. Therefore, tall stems are dominant.

A. F1, F2.

The F1 plants are all Tt hybrids. The recessive trait (tt) reappears in the F2 generation in about 25% of the plants.

B. G1, G2.

C. parental, F2.

D. F2, parental.

E. P1, P2