Question

Read the passage and answer the following question

Hemophilia is a genetic disorder caused by an X-linked recessive allele. It is of historical interest because of the extensive familial intermarriages of the royal houses of Europe during the seventeenth to nineteenth centuries AD.

This form of hemophilia is described by

• A. This disorder is caused by reduced production of thrombocytes in the bone marrow.
• B. This disorder is caused by an increased production of anti-thrombin.
• C. This disorder is caused by an absence of factor VIII in the blood.
• D. This disorder is caused by a loss of the clotting ability of thrombocytes, which are present in normal numbers in the blood.
• E. This disorder is caused by an increased level of anticoagulants in circulation and in the tissues.

Answer 1

The correct option is C This disorder is caused by an absence of factor VIII in the blood.

Hemophilia is an inherited bleeding disorder characterized by lacks or low levels of clotting factors resulting in the inability or impaired ability of blood clotting. Hemophilia A is caused by a deficiency of clotting factor VIII. Hemophilia B is also known as Christmas disease and is caused by a deficiency of clotting factor IX. Hemophilia C is caused by a deficiency of Factor XI blood clotting factor. Thrombocyte count is normal in this disease. Thus, the correct answer is option C.