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Q.

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

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a

Zero percent

b

50%

c

25%    

d

100%  

answer is D.

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Detailed Solution

Women is carrier (XCX), Husband is normal (XY), probability of colour blindness in daughter is zero.

Offspring - XCX (carrier daughter), XX (normal daughter), XCY (colour blind son), XY (normal son).

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