Hemophilia is a group of bleeding disorders. Blood clotting factors are needed to stop bleeding. They are low or missing in people with hemophilia.
The most common types are:
Hemophilia A (classic hemophilia)—caused by too little or no factor VIII (most common)
Hemophilia B (Christmas disease)—happens in males, caused by too little or no factor IX
A faulty gene on a certain DNA strand causes hemophilia. Females carry 2 copies of the strand. If one is faulty, the other one takes over. The faulty gene can pass to their children. If so, the female child will carry the gene. If it passes to the male, they will get the disease because they carry one copy of the strand.
It is possible for a female to get the disease. They would have to get the faulty gene from both parents.
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