Question

A tall pea plant with round seeds (TTRR) is crossed with a short pea plant with wrinkled seeds (ttrr). The \( F_1 \) generation will be:

• A. 25% tall with round seeds
• B. 50% tall with wrinkled seeds
• C. 75% tall with wrinkled seeds
• D. 100% tall with round seeds

Hint:

In dihybrid crosses, dominant traits will always appear in the F1 generation if at least one dominant allele is present.

Answer 1

The Correct Option is D

The following describes a dihybrid cross involving pea plants, focusing on plant height (T = tall, t = short) and seed shape (R = round, r = wrinkled), with independent assortment.The parent plants are:
- Tall, round seeds: TTRR
- Short, wrinkled seeds: ttrr
Based on the Punnett square for this cross:
- Tall parent (TTRR) produces gametes: TR.
- Short, wrinkled parent (ttrr) produces gametes: tr.
Consequently, the F1 generation will all inherit a dominant T and R allele, resulting in tall plants with round seeds.Therefore, the answer is (D) 100% tall with round seeds.