Question

In pea plants, tallness (T) is dominant to shortness (t). What are the predicted percentages of the genotypes of the offspring if a homozygous short plant is crossed with a heterozygous tall plant?
25 percent Tt, 75 percent tt
25 percent tall, 75 percent short
50 percent Tt, 50 percent tt
50 percent tall, 50 percent short

Answer 1

50 percent Tt, 50 percent tt.

Explanation: Tt (50%) × tt (100% t gametes) produces half Tt (T from heterozygote + t) and half tt (t + t), so genotypes are 50% Tt and 50% tt (phenotypes: 50% tall, 50% short).