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NEETZoologyPrinciples of Inheritance and Variation

Type of Cross Expected Outcome A. Incomplete dominance 1. 1:2:1 phenotypic ratio in F2 generation B. Codominance 2. 9:3:3:1 phenotypic ratio in F2 generation C. Monohybrid cross with complete dominance 3. 3:1 phenotypic ratio in F2 generation D. Dihybrid cross 4. Both phenotypes expressed equally

Options

  1. AA - 1, B - 4, C - 3, D - 2
  2. BA - 4, B - 1, C - 2, D - 3
  3. CA - 2, B - 3, C - 4, D - 1
  4. DA - 3, B - 2, C - 1, D - 4

Correct answer

A. A - 1, B - 4, C - 3, D - 2

Step-by-step solution

Incomplete dominance: 1:2:1 phenotypic ratio in F2 generation (e.g., pink flowers in snapdragons). Codominance: Both phenotypes are expressed equally (e.g., roan coat color in cattle). Monohybrid cross with complete dominance: 3:1 phenotypic ratio in F2 generation. Dihybrid cross: 9:3:3:1 phenotypic ratio in F2 generation.

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