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  4. A colour blind man (XC Y) has a colour blind sister (XCXC) and a normal brother (XY). What is the genotype of father and mother?

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Q. A colour blind man $(X^C Y)$ has a colour blind sister $(X^CX^C)$ and a normal brother $(XY)$. What is the genotype of father and mother?

Principles of Inheritance and Variation

Solution:

Correct answer is (b) $X^CY , X^CX$

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