question_answer

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?

A) 100%   

B)                                        0%                         

C)        25%                       

D)        50%

Correct Answer: B

Solution :

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