Question

Which one of the following inherited bleeding disorders is autosomal dominant?

(A) hemophilia A
(B) hemophilia B
(C) von Willebrand disease
(D) Christmas disease

Answer 1

Hemophilia A and hemophilia B are inherited in an X-linked recessive manner. Von Willebrand disease is an autosomal dominant disorder. Christmas disease, or hemophilia C, is caused by an autosomal chromosome defect.

Step-by-step explanation:

Hemophilia is a group of hereditary disorders that affect the body's ability to control blood clotting. The most common types of hemophilia, hemophilia A and hemophilia B, are inherited in an X-linked recessive manner, meaning they are passed from carrier females to affected males. However, von Willebrand disease is an autosomal dominant disorder, which means it can be inherited from either parent and can affect both males and females. Christmas disease, also known as hemophilia C, is a rare condition caused by an autosomal (not sex) chromosome defect that renders factor XI nonfunctional.