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# If boy's father has haemophilia and his mother has one gene for haemophilia.What is the chance that the boy will inherit the disease?

$\begin{array}{1 1}(A)\;\text{0%}\\(B)\;\text{50%}\\(C)\;\text{75%}\\(D)\;\text{100%}\end{array}$

50%
Hence (B) is the correct answer.