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NDA 2024 GAT · General Knowledge · Genetics and Heredity · hard

In a cross between two heterozygous tall pea plants (Tt × Tt), where tallness is dominant, the fraction of tall offspring expected is

Single correct option

In a cross between two heterozygous tall pea plants (Tt × Tt), where tallness is dominant, the fraction of tall offspring expected is
  1. A. 1/4
  2. B. 1/2
  3. C. 1
  4. D. 3/4
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Answer: (D) 3/4

Tt × Tt gives TT, Tt, Tt and tt in the ratio 1 : 2 : 1. TT and Tt are both tall, so 3 out of 4 are tall, and only tt is dwarf. The fraction 1/4 is the dwarf proportion. The 3 : 1 phenotypic ratio is Mendel's monohybrid result.
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Original question written in the NDA 2024 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