Question

The F₂ offspring of a monohybrid cross would show the genotype:

Options

• AA and Aa

• Aa and aa

• AA, Aa and aa

• Aa only

Answer 1

AA, Aa and aa

Explanation:

In a monohybrid cross, the F₁ generation typically consists of all heterozygous individuals (Aa). When these F₁ heterozygotes are self-crossed, the resulting F₂ generation shows a genotypic ratio of 1:2:1, meaning the genotypes AA, Aa, and aa appear in a ratio of 1 AA : 2 Aa : 1 aa. This occurs because each parent produces gametes with either the A or a allele, and random fertilization leads to all three possible genotypes in the offspringand.