A normal-visioned man whose father was colour blind, marries a woman whose father was also colourblind. They have their first child as a daughter. What are the chances that this child would be colourblind?

Step-by-step solution

Colour blindness is an X-linked disease. So, woman whose father was colourblind will be carrier for the disease. So, possibility of a colourblind daughter (i.e., X^ c X ^ c in F ₁ generation is 0 % .