Class 12 NEET Biology Human Health and Diseases Questions Part 1

(a) : Haemophilia B, a type of haemophilia is also known as christmas disease. It is due to deficiency of a blood coagulation factor, the christmas factor (factor IX). Christmas was the person ( 20 th century) in whom the factor was first identified. Haemophilia B is a defect of the blood which prevents its clotting.