alleryThe genotypic ratio in the F₂ of a monohybrid cross between Tt × Tt is
A3 : 1
B1 : 1
C9 : 3 : 3 : 1
D1 : 2 : 1
Answer & Solution
Correct answer: D. 1 : 2 : 1
Tt × Tt gives 1 TT : 2 Tt : 1 tt — a 1:2:1 genotypic ratio.
The 3:1 figure is the **phenotype** ratio because TT and Tt both look tall.
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