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WAEC Biology 2015 Question 40

Question 40

Mendelian Inheritance

Which of the following statements about human blood groups is not true?

  1. A.A is dominant over B
  2. B.O is recessive
  3. C.B is dominant over O
  4. D.A and B are co-dominant.
Show the answer and explanation

Answer: A (A is dominant over B)

Explanation

The alleles for A and B are co-dominant: a person with both has blood group AB. So 'A is dominant over B' is false, while O is recessive to both A and B.