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NEETZoologyPrinciples of Inheritance and Variation

F2 Phenotypic Combination Frequency in Dihybrid Cross A. Both dominant traits 1. 9/16 B. One dominant, one recessive trait 2. 3/16 C. Both recessive traits 3. 1/16 D. One recessive, one dominant trait

Options

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

Correct answer

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

Step-by-step solution

Both dominant traits: 9/16 (RRYY, RrYY, RRYy, RrYy). One dominant, one recessive trait: 3/16 (RrYy, RRYy). Both recessive traits: 1/16 (rryy). One recessive, one dominant trait: 3/16 (rrYy, RrYY).

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