A testcross is always performed between the individual that is heterozygous for the genes to be mapped and an individual who is ________.
A) heterozygous for the genes
B) homozygous dominant for the genes
C) homozygous recessive for the genes
D) lacking the genes

Question

Quizplus · Accepted Answer

The individual used in the testcross should be homozygous recessive for the genes being mapped, so that the phenotype of the offspring can indicate whether the individual being tested is heterozygous or homozygous dominant for the genes.

A Testcross Is Always Performed Between the Individual That Is