Question

The phenotypic ratio of incomplete dominance is ______.

Options

• 2 : 1

• 1 : 2 : 1

• 1 : 1 : 1

• 1 : 1 : 2

• 9 : 3 : 3 : 1

• 1 : 1

• 3 : 1

Answer 1

The phenotypic ratio of incomplete dominance is 1 : 2 : 1.

Explanation:

In incomplete dominance, both alleles are expressed partially and one gene does not suppress the expression of the other gene. As a result, the two heterozygotes are similar phenotypically and genotypically; hence, the genotypic and phenotypic ratio observed in the F₂ generation is 1 : 2 : 1.