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NEETZoologyPrinciples of Inheritance and Variation

A pea plant heterozygous for round seeds is crossed with a plant producing wrinkled seeds. If a total of 120 seeds are collected from this cross, what is the expected number of wrinkled seeds among the progeny?

Options

  1. A90
  2. B30
  3. C120
  4. D60

Correct answer

D. 60

Step-by-step solution

The cross is between a heterozygous round seed plant ( Rr ) and a homozygous recessive wrinkled seed plant ( rr ). This is a test cross: Rr rr . The expected progeny will have genotypes Rr (round) and rr (wrinkled) in a 1:1 ratio. Therefore, half of the progeny is expected to have wrinkled seeds. Expected number of wrinkled seeds = 1 2 120 = 60 . Answer: 60

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