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Parents – TT (Tall) × tt (Dwarf). F1 generation: Tt (Heterozygous Tall). On Selfing: Phenotypic ratio = 3:1 (Tall:Dwarf). Genotypic ratio = 1:2:1 (Homozygous Tall:Heterozygous Tall:Dwarf).

1. Phenotypic ratio = 3:1
2. Genotypic ratio = 1:2:1
3. Both phenotypic and genotypic ratios are correct
4. None of the above

Correct answer: Both phenotypic and genotypic ratios are correct

Solution

Selfing a heterozygous tall plant (Tt × Tt) produces TT, Tt, Tt, and tt. That gives a phenotypic ratio of 3 tall : 1 dwarf and a genotypic ratio of 1 TT : 2 Tt : 1 tt, so both statements are correct.

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