Question

A typical F₂ 1 : 2 : 1 phenotypic ratio in a monohybrid cross is characteristic of ______.

Options

• incomplete dominance

• co-dominance

• law of dominance

• dominant

Answer 1

A typical F₂ 1 : 2 : 1 phenotypic ratio in a monohybrid cross is characteristic of incomplete dominance.

Explanation:

In incomplete dominance, the heterozygote has an intermediate phenotype, so the F₂ phenotypic ratio matches the genotypic ratio: 1 : 2 : 1. Complete dominance typically gives a 3 : 1 phenotypic ratio.