Monohybrid Cross Problem Set
Problem 8: Predicting the results of a test cross
A test cross is used to determine if the genotype of a
plant with the dominant phenotype is homozygous
or heterozygous. If the unknown is homozygous, all of
the offspring of the test cross have the __________
phenotype. If the unknown is heterozygous, half of the
offspring will have the __________ phenotype.
Test cross with yy
In the test cross invented by Mendel, the plant with the dominant
phenotype is crossed with a plant that is homozygous for the
recessive trait. If the unknown is homozygous, all offspring will have
the dominant phenotype. If the unknown is heterozygous, half of the
offspring will have the recessive phenotype.
The Biology Project
Department of Biochemistry and Molecular
University of Arizona
Thursday, October 1, 1998
Revised: November 2004
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