Multiple choice

When a tall plant is crossed with a dwarf one, the ratio of pure tall: pure dwarf in the F2 generation will be

  1. 1 : 1

  2. 3 : 1

  3. 2 : 1

  4. 1 : 3
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A Correct answer
Explanation

In F2 of a monohybrid cross (Tt x Tt), the genotypic ratio is 1 TT: 2 Tt: 1 tt, so pure tall (TT): pure dwarf (tt) = 1:1. The phenotypic ratio is 3:1, but the question specifically asks for pure forms only. Option B (3:1) is the phenotypic ratio, not the pure homozygous ratio.

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