Final Answer:
Hemophilia B is caused by a deficiency of clotting factor IX.
Step-by-step explanation:
Hemophilia is a genetic disorder characterized by impaired blood clotting due to deficiencies in specific clotting factors. Hemophilia B, also known as Christmas disease, results from a deficiency of clotting factor IX. Clotting factor IX is one of the proteins involved in the coagulation cascade, contributing to the formation of blood clots.
Individuals with hemophilia B may experience prolonged bleeding after injuries or surgeries due to the impaired ability of blood to clot properly. The severity of symptoms can vary, with more severe cases leading to spontaneous bleeding. Hemophilia B is inherited in an X-linked recessive manner, primarily affecting males.