JAMB Biology 2023 Objective — Question 27
Question 27 of 40 from the Joint Admissions and Matriculation Board (JAMB) Biology 2023 Objective paper, with the correct answer and a full explanation.
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What is the number of alleles controlling blood groups in humans?
- A. 2
- B. 3Correct
- C. 4
- D. 5
Explanation
Blood groups in humans are controlled by three alleles: A, B and O; these determine the presence or absence of specific antigens on red blood cells, giving rise to four blood types: A, B, AB and O.
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