To identify whether an organism exhibiting a dominant trait is homozygous or heterozygous for a specific allele, a scientist can perform a test cross. The organism in question is crossed with an organism that is homozygous for the recessive trait

, and the offspring of the test cross are examined.

What is the purpose of a Testcross quizlet?

The purpose of the test cross is to determine if an individual is homozygous dominant/recessive or heterozygous dominant/recessive.

Why is a Testcross necessary to determine genotype?

An organism only needs one dominant allele to show the dominant trait. Why is a testcross necessary to determine genotype when an organism shows a dominant trait? ... A recessive allele t is responsible for a condition called dystonia. A man who has this condition marries a woman who doesn't.