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ZoologyNEET 2025Mendel's laws and deviations

Principles of Inheritance and Variation

Genes R and Y follow independent assortment. If RRYY produces round yellow seeds and rryy produces wrinkled green seeds, what will be the phenotypic ratio of the F₂ generation?

  1. A.Phenotypic ratio 1 : 2 : 1
  2. B.Phenotypic ratio 3 : 1
  3. C.Phenotypic ratio 9 : 3 : 3 : 1✓
  4. D.Phenotypic ratio 9 : 7

Solution

Independent assortment of two genes in a dihybrid cross gives the classical 9 : 3 : 3 : 1 phenotypic ratio in the F₂ (round yellow : round green : wrinkled yellow : wrinkled green).

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