IMAT 2011 Q50 [Haemophilia]

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1

Haemophilia is caused by a recessive allele carried only on the X chromosome. A carrier female and a non-haemophiliac male decide to have a child. Which of the following four statements are correct?

  1. they have a 25% chance of producing a haemophiliac son
  2. they have a 25% chance of producing a haemophiliac daughter
  3. they have a 25% chance of producing a carrier son
  4. they have a 25% chance of producing a carrier daughter

A. 1 and 2 only

B. 1 and 4 only

C. 2 and 3 only

D. 2 and 4 only

E. 3 and 4 only