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WAEC Biology 2010 Question 56

Question 56

Chromosomes, DNA and Sex Linkage

The percentage probability that a normal male married to a carrier woman would have a haemophilic male child is

  1. A.35%.
  2. B.50%.
  3. C.75%.
  4. D.100%.
Show the answer and explanation

Answer: B (50%.)

Explanation

XHY × XHXh: every son gets Y from the father and one X from the mother, so half the sons (XhY) are haemophilic.