Question

The family pedigree of Queen victoria shows a number of haemophilic descendents as

• A. She herself was haemophilic.
• B. Haemophilia is autosomal recessive disorder.
• C. Haemophilia is sex linked recessive disorder and Queen Victoria was a carrier.
• D. Haemophilia is caused by contact and therefore it was seen in the royal family descendants.

Answer 1

Answer: (C)

Haemophilia is sex linked recessive disorder and Queen Victoria was a carrier.

The family pedigree of Queen Victoria shows a number of hemophilic descendants because hemophilia is sex-linked recessive disorder and Queen Victoria was a carrier. X-linked recessive or sex-linked recessive disease most often occurs in males because Males have only one X chromosome. A single recessive gene on that X chromosome will cause the disease. Females have two X chromosomes so they can act as carriers for the disease. Hemophilia is a bleeding disorder that slows the blood clotting process.

So, the correct answer is 'Haemophilia is sex-linked recessive disorder and Queen Victoria was a carrier'.