Why does the son of a carrier mother and a normal father suffer from haemophilia, whereas the son of a haemophilic father and a normal mother would not? Explain.

Why does the son of a carrier mother and a normal father suffer from h

1.	Why does the son of a carrier mother and a normal father suffer from haemophilia, whereas the son of a haemophilic father and a normal mother would not? Explain.
Answer» The gene for haemophilia is present in the X-chromosome. The son receives the X-chromosome from his mother; so, a carrier-mother passes on the disease to 50% of her sons. When the mother is normal, the sons have no chance of getting the disease, even if the father is haemophilic, because father passes on the Y-chromosome to his sons.

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Why does the son of a carrier mother and a normal father suffer from haemophilia, whereas the son of a haemophilic father and a normal mother would not? Explain.

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