Zoology - Principles of Inheritance and Variation Question with Solution | TestHub

The most common form of red-green colour blindness is an ' $\mathrm{X}$ chromosome linked recessive' disorder. The 'red' and 'green' genes are known to reside at the tip of the long arm of the $\mathrm{X}$ chromosome. Women have two copies of the X-chromosome, and so they may have normal colour vision, even if they carry one copy of the defective gene. Men have only one X-chromosome, and so will be colour blind.