Q. More men suffer from colourblindness than women because
A) Women are more resistant to disease than men
B) The male sex hormone testosterone causes the disease
C) The colourblind gene is carried on the ‘Y’ chromosome
D) Men are hemizygous and one defective gene is enough to make them colourblind
Explanation
The gene for colour blindness is present on X-chromosome. If one X-chromosome of female have gene for colour blindness, this will be carrier (normal) but if a male have gene on X-chromosome it will be colourblind (since only one X-chromosome is present in male).
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.