alleryIn Mendel's monohybrid cross between a pure tall and a pure dwarf pea plant, what is the phenotypic ratio observed in the F2 generation?
A1 tall : 1 dwarf
B9 tall : 7 dwarf
C3 tall : 1 dwarf
D2 tall : 1 dwarf
Answer & Solution
Correct answer: C. 3 tall : 1 dwarf
1. Cross parents TT (tall) and tt (dwarf); all F1 are Tt and tall.
2. Self the F1: Tt x Tt.
3. Punnett square gives 1 TT : 2 Tt : 1 tt.
4. TT and Tt both look tall (3), tt is dwarf (1).
5. So the phenotypic ratio is 3 tall : 1 dwarf, which is option C.
_Source: Samacheer Kalvi (TN SCERT) Class 10 Science, Unit 18 Genetics "Monohybrid Cross", p.269_
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