I have some problems solving sex-linked genetic questions. Can anybody help me?

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x.ana

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I am finding it hard to understand the whole concept of sex linked genetics. Here is an example and someone pls help me undestand the question.

Haemophilia is inherited as an X - linked recessive trait. An apparently normal women whose father was haemophiliac marries a normal man.

(a) What proportion of their sons have haemophilia?
(b) What proportion of their daughters will have haemophilia?
(c) What proportion of their daughters will be carriers?
 
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