Q.

Select the incorrect statement with regard to haemophilia.

Moderate

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It is a dominant disease.

A single protein involved in the clotting of blood is affected

It is a sex-linked disease.

It is a recessive disease.

answer is A.

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Detailed Solution

Haemophilia is a X-linked recessive trait which shows transmission from carrier female to male progeny. Single protein is affected in this condition. The three main forms of hemophilia include the following: Hemophilia A: Caused by a lack of the blood clotting factor VIII; approximately 85% of hemophiliacs have type A disease. Hemophilia B: Caused by a deficiency of factor IX. Hemophilia C: Some doctors use this term to refer to a lack of clotting factor XI.

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