Two gene loci, A and B, assort independently, and alleles A and B are dominant over alleles a and b.What is the probability of producing an AABB zygote from a cross AaBb × AaBb?
A)1/4
B)1/2
C)1/16
D)9/16
E)1 (100%)

Question

Quizplus · Accepted Answer

First, determine the gametes that can be produced from each parent using the FOIL method (First, Outer, Inner, Last):
AaBb:
- AB
- Ab
- aB
- ab

The probability of getting AABB in the offspring is the probability of getting an AaBb from each parent multiplied:
1/4 x 1/4 = 1/16.

Two Gene Loci, a and B, Assort Independently, and Alleles