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
Test cross with yy
Although the unknown genotype could also be determined by a cross with a known heterozygote, test crosses are done with homozygous recessive individuals. If the unknown is heterozygous, the recessive trait will be present in half of the offspring.
The Biology Project
Department of Biochemistry
and Molecular Biophysics
University of Arizona
Thursday, October 1, 1998
Revised: November 2004
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