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
Since males have only one X chromosome (XY), a single faulty gene causes the disease.
There are two primary forms, depending on which protein is missing: bleeder's disease
In the 19th and 20th centuries, it was famously known as the "Royal Disease." Queen Victoria was a carrier and passed the gene to various royal houses across Europe, including the ruling families of Spain, Germany, and Russia. The most famous case was Alexei Nikolaevich, the Tsar’s son, whose condition led the family to seek help from the mystic Rasputin, indirectly impacting the Russian Revolution. Types and Severity
Hemophilia is almost always inherited and is "X-linked." This means the gene responsible for the condition sits on the X chromosome. Since females have two X chromosomes (XX), a
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.
While it remains a lifelong challenge, hemophilia is no longer the death sentence it was in the Victorian era; it is now a manageable chronic condition. The most famous case was Alexei Nikolaevich, the
"Bleeder's disease" is the historical and colloquial name for , a rare genetic disorder where the blood doesn't clot normally. Because the body lacks sufficient clotting proteins (factors), even minor injuries can lead to prolonged bleeding, and internal bleeding into joints can cause permanent damage. The Genetic Blueprint