alleryGenotypic ratio of a monohybrid F2 (Tt × Tt):
A1:2:1 (TT : Tt : tt)
B1:1
C3:1
D9:3:3:1
Answer & Solution
Correct answer: A. 1:2:1 (TT : Tt : tt)
Cross Tt × Tt yields TT
(1) : Tt (2) : tt (1). Phenotypic 3:1 (T_:tt).
Genotypic 1:2:1. Genotypic ratio always 'more informative' than phenotypic.
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