Question

A sex linked trait/ disease is?

• A. Colour blindness/ haemophilia
• B. Night blindness/albinism
• C. Myxoedema/beri-beri
• D. Deafness/ tylosis

Answer 1

The correct option is A Colour blindness/ haemophilia

• Color blindness: It is sex-linked: genetic red-green color blindness affects males much more often than females because the genes for the red and green color receptors are located on the X chromosome, of which males have only one and females have two. Females (XX) are red-green color blind only if both their X chromosomes are defective with a similar deficiency, whereas males (XY) are color blind if their single X chromosome is defective.

• Haemophilia: It is a recessive X-linked genetic disorder resulting in a deficiency of functional clotting Factors. Hemophilia is a sex-linked recessive disorder. These kinds of defects occur more often in men than in women.
  

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