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NEETZoologyPrinciples of Inheritance and Variation

A pea plant heterozygous for both seed shape (round) and seed colour (yellow) is crossed with a plant producing wrinkled, green seeds. If a total of 400 progenies are obtained from this cross, what is the expected number of plants producing round and green seeds?

Options

  1. A75
  2. B100
  3. C200
  4. D225

Correct answer

B. 100

Step-by-step solution

The cross described is a dihybrid test cross. Genotype of the heterozygous round and yellow seed plant: RrYy Genotype of the wrinkled and green seed plant (double recessive): rryy Cross: RrYy rryy The gametes produced by RrYy are RY , Ry , rY , and ry in equal proportions. The gametes produced by rryy are all ry . The expected phenotypic ratio of the progenies is 1:1:1:1 (Round Yellow : Round Green : Wrinkled Yellow : Wrinkled Green). The fraction of progenies with round and green seeds ( Rryy ) is 1 4 . Expected n

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