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WAEC Biology 2019 Question 47

Question 47

Mendelian Inheritance

A man whose blood group is heterozygous B is married to a woman whose blood group is also heterozygous B. Which of the following statements is correct about the blood group of their four offspring?

  1. A.Three of them belong to blood group B
  2. B.Three of them belong to blood group O
  3. C.None of them belongs to blood group O
  4. D.Two of them belong to blood group B
Show the answer and explanation

Answer: A (Three of them belong to blood group B)

Explanation

BO × BO gives BB, BO, BO and OO. Three of the four expected children are group B and one is group O.