Monohybrid Cross Problem Set
Problem 1: The monohybrid cross
In pea plants, spherical seeds (S) are dominant to dented
seeds (s). In a genetic cross of two plants that are heterozygous for the
seed shape trait, what fraction of the offspring should have spherical
3/4 of the offspring will have the dominant phenotype:
one fourth will be homozygous dominant (SS) and one half will be heterozygous (Ss.)
One fourth will be homozygous recessive (ss) and 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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