A testcross is
A) a mating between an individual of unknown genotype and an individual homozygous recessive for the trait of interest.
B) a mating between an individual of unknown genotype and an individual heterozygous for the trait of interest.
C) a mating between two individuals heterozygous for the trait of interest.
D) a mating between two individuals of unknown genotype.

Question

Quizplus · Accepted Answer

A testcross involves mating an individual of unknown genotype with a known homozygous recessive individual for the trait of interest. This is done to determine whether the unknown individual is heterozygous or homozygous dominant for the trait. Therefore, choice A is the correct answer.

A Testcross Is