Question

A tall pea plant with round seeds (TTRR) is crossed with a short pea plant with wrinkled seeds (ttrr). The F₁ generation will be ______.

Options

• 25% tall with round seeds

• 50% tall with wrinkled seeds

• 75% tall with wrinkled seeds

• 100% tall with round seeds

Answer 1

A tall pea plant with round seeds (TTRR) is crossed with a short pea plant with wrinkled seeds (ttrr). The F₁ generation will be 100% tall with round seeds.

Explanation:

The crossing of a tall pea plant with round seeds (TTRR) with a short pea plant with wrinkled seeds (ttrr) results in F₁ offspring with the genotype TrRr. Because T (tall) and R (round) are dominant features, all offspring will exhibit the dominant phenotypes, resulting in 100% F₁ plants with tall, round seeds.