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WAEC Biology 1988 Question 51

Question 51

Mendelian Inheritance

A man with blood group A (IAp) married a woman with blood group O (pp). Which of the following is the probable ratio of the blood groups of the offspring?

  1. A.1:1
  2. B.3:1
  3. C.2:1:1
  4. D.1:2:1
  5. E.4:1
Show the answer and explanation

Answer: A (1:1)

Explanation

The man gives either the A allele or the O allele, the woman only O, so children are group A or group O in a 1 : 1 ratio.