Question

Which pair of diseases are caused by genes located on X-chromosomes?

• A. Colour blindness, albinism
• B. Colour blindness, hypertrichosis
• C. Colour blindness, phenylketonuria
• D. Colour blindness, haemophilia

Answer 1

The correct option is D Colour blindness, haemophilia

Colour blindness, haemophilia: Both are X-linked recessive disorders. Sex-linked diseases are X - linked. In other words, the defective genes are only found on the X-chromosomes. Out of 46 chromosomes, 44 are autosomal. The remaining 2 chromosomes are sex chromosomes.

So, the correct answer is 'Colour blindness, haemophilia'.