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
One fourth of the offspring will be homozygous dominant (SS), one half will be heterozygous (Ss), and one fourth will be homozygous recessive (ss).
The Biology Project
Department of Biochemistry and Molecular
University of Arizona
Thursday, October 1, 1998
Revised: November 2004
Contact the Development Team
All contents copyright © 1998-2004. All rights reserved.