Question

A cross between two individuals results in a ratio of 9 : 3 : 3 : 1 for four possible phenotypes of progeny. This is an example of a ______.

Options

• dihybrid cross

• monohybrid cross

• test cross

• none of these

Answer 1

A cross between two individuals results in a ratio of 9 : 3 : 3 : 1 for four possible phenotypes of progeny. This is an example of a dihybrid cross.

Explanation:

A 9 : 3 : 3 : 1 phenotypic ratio is the characteristic F₂ generation ratio of a dihybrid cross, where two pairs of contrasting traits are inherited independently according to Mendel’s Law of Independent Assortment.