Question

Give scientific reason for the following statement. Colour blindness is more common in men than in women.

Answer 1

• Colour blindness is an X-linked recessive disorder. It is generally passed down from a carrier woman to male child.
• The disease is more common in males because of the presence of only one X-chromosome as compared to two X-chromosomes in females.
• X-linked characters are expressed more commonly in males than in females because males express the character in hemizygous condition.