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WAEC Biology 2013 Question 54

Question 54

Chromosomes, DNA and Sex Linkage

A man who suffers from haemophilia marries a woman who is a carrier, what percentage of their children are likely to be haemophilic?

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

Answer: B (50%.)

Explanation

XhY × XHXh gives XHXh, XhXh, XHY and XhY; two of the four (50%) are haemophilic.