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WAEC Biology 2007 Question 55

Question 55

Mendelian Inheritance

What is the probability of producing a child of blood group O by a woman of blood group O and a man of blood group A?

  1. A.25%
  2. B.50%
  3. C.75%
  4. D.100%
Show the answer and explanation

Answer: B (50%)

Explanation

An O child is possible only if the man is AO; then AO × OO gives AO and OO in equal numbers, so the chance is 50%.