NEET Previous Year Question
A tall true breeding garden pea plant is crossed with a dwarf true breeding garden pea plant. When the F1 plants were selfed the resulting genotypes were in the ratio of:
Topic: NEET PYQ
Answer: A. Full step-by-step solution below.
- A1 : 2 : 1 :: Tall homozygous : Tall heterozygous : Dwarf
- B1 : 2 : 1 :: Tall heterozygous : Tall homozygous : Dwarf
- C3 : 1 :: Tall : Dwarf
- D3 : 1 :: Dwarf : Tall
Correct answer: A
Solution
(a) A true-breeding tall plant (TT) crossed with a true-breeding dwarf plant (tt) produces all tall F₁ plants (Tt). On selfing (Tt × Tt), the F₂ generation has the genotypic ratio:TT (Tall homozygous) = 1
Tt (Tall heterozygous) = 2
tt (Dwarf) = 1
Thus, the genotypic ratio is 1 : 2 : 1.
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