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JAMB Biology 2011 Objective — Question 56

Question 56 of 60 from the Joint Admissions and Matriculation Board (JAMB) Biology 2011 Objective paper, with the correct answer and a full explanation.

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A man with blood group IA IA is married to a woman with blood group IA IO. The blood group of their son is likely to be

  • A. A. ACorrect
  • B. B. AB
  • C. C. O
  • D. D. B

Explanation

Since allele A is dominant over O, the child of this cross can only be blood group A.

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