Question

The F₁ 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 only

Explanation:

In a monohybrid cross where one parent is homozygous dominant (AA) and the other is homozygous recessive (aa), the F₁ offspring all have the heterozygous genotype Aa. This is because each offspring receives one dominant allele A from one parent and one recessive allele a from the other parent, resulting in all F₁ individuals being heterozygous (Aa) only. There are no homozygous genotypes (AA or aa) in the F₁ generation in this scenario.