What is the greatest benefit of using a testcross to determine an unknown genotype?
A) The homozygous recessive parent is obvious to the naked eye.
B) The homozygous parent is the only one whose crossovers make a difference.
C) A progeny's phenotype reflects the contribution from the heterozygous parent.
D) All of the progeny will be heterozygous.

Question

What is the greatest benefit of using a testcross to determine an unknown genotype?
A) The homozygous recessive parent is obvious to the naked eye.
B) The homozygous parent is the only one whose crossovers make a difference.
C) A progeny's phenotype reflects the contribution from the heterozygous parent.
D) All of the progeny will be heterozygous.

Quizplus · Accepted Answer

A testcross involves crossing an individual with an unknown genotype with a homozygous recessive individual. The phenotypes of the progeny directly reflect the contribution of the alleles from the unknown genotype, making it possible to determine the unknown genotype based on the observed phenotypes.

What Is the Greatest Benefit of Using a Testcross to Determine