The Student Room Group

genetics

A husband and wife show no signs of haemophilia. However, the woman's father had haemophilia. The woman becomes pregnant and an ultrasound scan shows that the foetus is male. They visit a genetic counsellor to find out what the chance is that the baby boy will have haemophilia.

You are the genetic counsellor, explain to the parents in no more than 250 words, how haemophilia is inherited and the probability that the baby boy will have haemophila. Remember to explain any specific terms and concepts that you may use as the parents are intelligent but have very biological knowledge.

anyone?
Haemophilia is X linked, which means its much more likely to affect males than females- you could research this and explain X-linkage to parents ( in speech)
Surely before getting into all this they should do a simple blood test on the mother to see if she carries the defective gene? In which case it would be 50% chance.

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