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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: 9 : 3 : 3 : 1

Solution

The cross between AABB and aabb results in a 9:3:3:1 ratio of F2 genotypes, as predicted by Mendelian genetics.

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