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WBCS Preliminary Examination 2015 — General Studies · Question 183 of 200

Q183
General ScienceBiology
Phenotypic ratio of Mendelian Dihybrid cross is
  1. a.9:3:3:1
  2. b.1:1:1:1
  3. c.3:4:3:1
  4. d.1:2:1:1

Answer: (A) 9:3:3:1

In a Mendelian dihybrid cross (AaBb × AaBb), the F2 phenotypic ratio is 9:3:3:1 — representing 9 dominant for both traits : 3 dominant for first, recessive for second : 3 recessive for first, dominant for second : 1 recessive for both. This follows the Law of Independent Assortment.

Q182 Whole paperQ184