Question

A test cross distinguishes between: 

Options

• two homozygous forms

• two heterozygous forms

• a homozygous dominant and the heterozygous form

• a homozygous recessive and a heterozygous form

Answer 1

a homozygous dominant and the heterozygous form

Explanation:

A test cross is used to determine whether an individual showing a dominant phenotype is homozygous dominant or heterozygous. It involves crossing the individual with a homozygous recessive individual. This allows distinguishing between a homozygous dominant and a heterozygous form based on the phenotypes of the offspring.