What fraction of offspring of the cross AaBb × AaBb would be homozygous for both the dominant alleles, assuming that they are on different chromosomes?
A) 1/4
B) 1/8
C) 1/16
D) 1/32
E) 1/64

Question

Quizplus · Accepted Answer

When crossing two individuals heterozygous for two different genes (AaBb x AaBb), the probability of producing offspring that are homozygous for both dominant alleles is 1/16, or 6.25%. This is because there are four possible gamete combinations that can be made by each parent (AB, Ab, aB, ab) and therefore 16 possible offspring genotypes. Of these 16 possible genotypes, only one is homozygous dominant for both traits (AABB).

What Fraction of Offspring of the Cross AaBb × AaBb