When Mendel’s first-generation pea plants (Hh) were allowed to self-pollinate (Hh x Hh), the ratio of tall (dominant) to short (recessive) plants in the second generation was

Question

Responses
A 1:1.
B 1:3.
C 2:2.
D 3:1.

Answer 1

When Mendel's first-generation pea plants (Hh) were allowed to self-pollinate (Hh x Hh), the expected ratio of tall (dominant) to short (recessive) plants in the second generation is 3:1. This is due to the following Punnett square results:

• HH (homozygous dominant) - Tall
• Hh (heterozygous) - Tall
• Hh (heterozygous) - Tall
• hh (homozygous recessive) - Short

Thus, there are 3 tall plants to every 1 short plant, leading to the ratio of 3:1.

The correct answer is D: 3:1.