Question

Which of the following statement is true for colour blindness?

• A. It is due to a mutation in certain genes present on 21^st pair of the chromosome.
• B. It occurs more in female as compared to male.
• C. The son of the carrier woman has 50% chances of being colour blind.
• D. It is an autosomal linked genetic disorder.

Answer 1

Answer: (C)

Colour blindness is X linked recessive genetic disorder, in which due to recessive allele present on X chromosome pigments are not synthesized by cones cells of eye thus the person is unable to distinguish between the primary colour red and green. It occurs more in males than in females and a carrier female can transfer the defective allele to 50% of its son.