Dihybrid Cross

Problem 8: Heterozygous offspring of a dihybrid cross.

Following a SsYy x SsYy cross, what fraction of the offspring are predicted to have a genotype that is heterozygous for both characteristics?

A. 1/16

B. 2/16

C. 3/16

D. 4/16

Four out of 16 possible combinations of alleles yield the SsYy genotype. They are:
SY and sy,
sY and Sy,
Sy and sY,
SY and sy.

E. 9/16

The Biology Project
University of Arizona
Tuesday, August 13, 1996
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