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NEETZoologyPrinciples of Inheritance and Variation

Cross Examples A. Dihybrid cross 1. RrYy × rryy B. Test cross of dihybrid 2. YYRR × yyrr C. Monohybrid cross 3. Yy × yy D. Back cross 4. F1 × recessive parent

Options

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

Correct answer

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

Step-by-step solution

Dihybrid cross: YYRR × yyrr (cross involving two traits). Test cross of dihybrid: RrYy × rryy (dihybrid crossed with a homozygous recessive individual). Monohybrid cross: Yy × yy (cross involving one trait). Back cross: F1 crossed with one of the parents (usually the recessive one).

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