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NDA 2025 GAT · General Knowledge · Genetics and Heredity · medium

In a dihybrid cross between two heterozygous pea plants (RrYy x RrYy), the phenotypic ratio of the F2 generation is

Single correct option

In a dihybrid cross between two heterozygous pea plants (RrYy x RrYy), the phenotypic ratio of the F2 generation is
  1. A. 3:1
  2. B. 1:2:1
  3. C. 9:3:3:1
  4. D. 1:1:1:1
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Answer: (C) 9:3:3:1

Mendel's law of independent assortment gives four phenotypes in the ratio 9 round-yellow : 3 round-green : 3 wrinkled-yellow : 1 wrinkled-green. The 3:1 ratio is for a monohybrid cross, 1:2:1 is the genotypic ratio for a monohybrid cross, and 1:1:1:1 is a test-cross ratio.
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Original question written in the NDA 2025 GAT pattern and checked twice for the correct answer. Not an official question paper. How we write and check questions · Corrections policy · Report a mistake