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WAEC Biology 1994 Question 58

Question 58

Mendelian Inheritance

Which of these statements is correct in the human ABO blood grouping system?

  1. A.B is recessive
  2. B.A is dominant over B
  3. C.O is recessive
  4. D.O has antigene A and B
  5. E.A and B are both recessive
Show the answer and explanation

Answer: C (O is recessive)

Explanation

O is recessive to both A and B (A and B are co-dominant with each other).