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JAMB Biology 2011 Question 46

Question 46

Mendelian Inheritance

The number of alleles controlling blood groups in humans is

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

Answer: C (3)

Explanation

The ABO blood groups are controlled by three alleles: IA, IB and IO. Different pairs of these give groups A, B, AB and O.