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WAEC Biology 2016 Question 42

Question 42

Mendelian Inheritance

A cross between two parents produced four offspring with blood groups AB, BB, BO and AO. What is the blood group of their parents?

  1. A.AA and BO
  2. B.BB and AO
  3. C.AB and BO
  4. D.AB and AO
Show the answer and explanation

Answer: C (AB and BO)

Explanation

AB × BO gives gametes A, B and B, O, so the children can be AB, AO, BB and BO, exactly the four groups shown.