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On selfing a plant of F1 generation with genotype “AABbCC”, the genotypic ratio in F2 generation will be

1. 3 : 1
2. 1 : 2 : 1
3. 9 : 3 : 3 : 1
4. 27 : 9 : 9 : 3 : 3 : 3 : 1

Correct answer: 27 : 9 : 9 : 3 : 3 : 3 : 1

Solution

In AABbCC, only the B locus segregates on selfing because A and C are homozygous. So the cross is effectively AA × AA, Bb × Bb, and CC × CC, giving only two B-genotypes while A and C stay fixed. The combined F2 genotypic ratio is therefore 1:2:1 for B, expanded across the fixed loci as 27:9:9:3:3:3:1.

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