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In a cross between AABB × aabb, the ratio of F2 genotypes between AABB, AaBB, Aabb and aabb would be

1. 9 : 3 : 3 : 1
2. 2 : 1 : 1 : 2
3. 1 : 2 : 2 : 1
4. 7 : 5 : 3 : 1

Correct answer: 1 : 2 : 2 : 1

Solution

The parental cross produces all AaBb in F1, and selfing AaBb gives a 1:2:1 genotype ratio at each locus. Combining the A-locus and B-locus outcomes for the four requested genotypes gives 1 AABB : 2 AaBB : 2 Aabb : 1 aabb.

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