Monohybrid Cross Problem Set
Problem 7: The test cross
|To identify the genotype of yellow-seeded pea plants as
either homozygous dominant (YY) or heterozygous
(Yy), you could do a test cross with plants of genotype
A cross with the homozygous recessive (yy) is a test cross. If the parent of unknown genotype is heterozygous (Yy), half of the
offspring will have the recessive trait. The unknown genotype could also be determined by a cross with a known heterozygote (Yy).
The Biology Project
Department of Biochemistry and Molecular
University of Arizona
Thursday, October 1, 1998
Revised: November 2004
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