Since males have only one X chromosome (XY), a single faulty gene causes the disease.
Since females have two X chromosomes (XX), a healthy gene on one can usually compensate for a faulty one on the other. The Royal Connection bleeder's disease
Hemophilia is almost always inherited and is "X-linked." This means the gene responsible for the condition sits on the X chromosome. Since males have only one X chromosome (XY),
The most common type, caused by a lack of Factor VIII . bleeder's disease
There are two primary forms, depending on which protein is missing:
Recent breakthroughs are aiming for "cures" by using viruses to deliver functional genes into the patient's liver, allowing the body to produce its own clotting factors.