3. Consider another situation where the mother is hemophiliac (both of her X chromosomes have the hemophilia gene), and the father is not hemophiliac. If they have 4 children (2 sons and 2 daughters), which of these children will most definitely be hemophiliac?
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Answer:
Hemophilia is a bleeding disorder in which blood does not clot properly. Blood contains many proteins, called clotting factors, that can help to stop bleeding after injury or surgery. People with hemophilia have low amounts of either factor VIII (eight) or factor IX (nine), key factors responsible for normal blood clotting.