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:

• 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 genetic crosses, the dominant trait is always expressed in the offspring if at least one dominant allele is present.

Answer 1

The Correct Option is D

Step 1: Identifying the traits. - Tall (T) is dominant to short (t), and round (R) is dominant to wrinkled (r).
- The parental genotypes are TTRR (tall, round) and ttrr (short, wrinkled).
Step 2: Analyzing the F₁ generation. - The F₁ generation will inherit one allele from each parent.
- All F₁ plants will have the genotype TtRr, making them heterozygous for both traits.
Step 3: Conclusion. Since tall (T) and round (R) are both dominant, all F₁ plants will be tall with round seeds.