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?

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Solution

Q.
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 [2014]

1 25%

2 0%

3 50%

4 75%

Ans.
(3)

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 $X^{c} X$ . A cross between them can be represented as below.

Therefore, 50% of male children of this couple will be colour blind.

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