Monohybrid Cross Problem Set
Problem 2: Mendel's First Law
A phenotypic ratio of 3:1 in the offspring of a mating of two
organisms heterozygous for a single trait is expected when:
A. the alleles segregate during meiosis.
B. each allele contains two mutations.
C. the alleles are identical.
D. the alleles are incompletely dominant.
E. only recessive traits are scored.
The Biology Project
Department of Biochemistry and Molecular
University of Arizona
Thursday, October 1, 1998
Revised: November 2004
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