Dihybrid Cross

Problem 7: Homozygous offspring of a dihybrid cross.

In a dihybrid cross, AaBb x AaBb, what fraction of the offspring will be homozygous for both recessive traits?

A. 1/16
1/4 of the gametes of each parent will be ab. The fraction of the offspring homozygous for both recessive traits will be 1/4 times 1/4, or 1/16.

B. 1/8

C. 3/16

D. 1/4

E. 3/4


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