A man whose father was colour blind marries a woman who had a colour blind mother and normal father.

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4.Principles of Inheritance and Variation

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A man whose father was colour blind marries a woman who had a colour blind mother and normal father. What percentage of male children of this couple will be colour blind?

$0.25$

$0$

$0.5$

$0.75$

(NEET-2014)

Solution

(c) : It is given that the man had colour blind father, $i.e.$, man’s genotype would be $XY$. Now, the woman had a colourblind mother and normal father, thus her genotype would be $X^cX$. A cross between them can be represented as below. Therefore, $50\%$ of male children of this couple will be colour blind.

Standard 12

Biology