The document discusses haemophilia A, which is an X-linked bleeding disorder caused by a deficiency in coagulation factor VIII. It provides details on the genetics and molecular basis of the condition, describing how the factor VIII gene is located on the X chromosome and can be affected by inversions or point mutations. Signs and symptoms involve bleeding episodes in joints, muscles or other tissues. Diagnosis involves testing for prolonged activated partial thromboplastin time and prothrombin time. Treatment relies on regular infusions of replacement factor VIII to control bleeding, though some patients develop inhibitors requiring alternative treatments.