A hybrid round tall pea plant is pollinated by the same kind of plant how many percent would hybrid offspring plants would have?

Question

A. 100%

B. 75%

C. 50%

D. 25%

Answer 1

First, let's get the genotype for your hybrid (heterozygous) tall pea plant. Assuming being tall is a dominant trait, we can write this as Tt. If it's pollinated by the same type of plant, this means the second plant parent is also Tt.

For a Tt x Tt cross, fill out a Punnett Square. You will see the cross gives you 1 TT, 2 Tt, and 1 tt.

This means you will have a 1/4 chance of getting TT or tt offspring, and a 2/4 (or 1/2) chance of getting a Tt hybrid offspring. Since 1/2 = 50%, the answer is C.