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JAMB Biology 1995 Question 43

Question 43

Mendelian Inheritance

A man with blood group A is married to a woman with blood group A. Which of the followng group combinations is possible if the family has three children?

  1. A.B, A, AB
  2. B.O, A, B
  3. C.B, AB, AB
  4. D.A, O, A.
Show the answer and explanation

Answer: D (A, O, A.)

Explanation

If both parents are AO, their children can be A (AA or AO) or O (OO); B and AB are impossible as neither parent has a B allele.