what is the probability of a male child being haemophilic , if his mother is a carrier of the disease and his father is a normal person?

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Solution

Haemophilia is an X linked recessive disorder.
If the mother is a carrier then it means that one of her X chromosome has allele for haemophilia.
Father is normal this means that he is free of this allele for haemophilia.
Lets make a cross:
Mother genotype: X^hX
Fathers genotype: XY

X^h X
X X^hX XX
Y X^hY XY
The probability of male child being haemophilic is 50%

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