Explanation

Colour blindness is a disease, in which a person is unable to differentiate between red and green colour. The gene for this disease is located on the X-chromosome. So, if a colourblind woman marries a normal man, it will produce all the sons colourblind $(X^{c}Y)$. In case of a carrier woman, the probability of a colourblind and normal son is 50 : 50 [image:5c_image48.jpeg]