In a monohybrid cross AA * aa, what proportion of heterozygotes is expected among the F₂ offspring? A)1/4 B)1/2 C)3/4 D)All are heterozygotes. E)None are heterozygotes.

Question

Quizplus · Accepted Answer

In a monohybrid cross, the ratio of heterozygotes to homozygotes is 1:2. Therefore, in the F1 generation, all individuals will be heterozygous (F1F1). When these heterozygotes are crossed with homozygous recessive (aa) individuals, the resulting offspring will have a 1:1 ratio of heterozygotes to homozygous recessive individuals. So, among the F₂ offspring, half of them are expected to be heterozygotes (F1U1B12F1 and F1U1B0F1). Therefore, the correct answer is B.

In a Monohybrid Cross AA * Aa, What Proportion of Heterozygotes