Question

Which one of the following diseases in man belongs to the same category as haemophilia?

• A. Hypermetropia
• B. Rabies
• C. Night blindness
• D. Colour blindness

Answer 1

The correct option is D Colour blindness

Colour blindness and haemophilia are both X-linked recessive disorders.

Red-green colour blindness, a very common trait in humans affects between 7% and 10% of men and 0.49% to 1% of women.

Hemophilia A, a blood clotting disorder is caused by a mutation of the factor VIII gene and hemophilia B, also known as 'Christmas disease', is a blood clotting disorder, caused by a mutation of the factor IX gene.