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WAEC Biology 2010 Question 54

Question 54

Mendelian Inheritance

Mr. Andrew, his wife and child belong to blood groups A, B and O respectively. The genotypes of both parents are

  1. A.IAIO and IBIB.
  2. B.IAIA and IBIB.
  3. C.IAIB and IAIO.
  4. D.IAIO and IBIO.
Show the answer and explanation

Answer: D (IAIO and IBIO.)

Explanation

A group O child is IOIO, so each parent must carry an IO allele: father IAIO, mother IBIO.