hemophilia

Women have two the X-chromosome but mab have one X-chromosome.Normaly women is XX,carrier XXh,normaly man XY,hemophilia XhY.for exs.carrier women merried with normaly man:

Parent         :         Carrier women (XXh) X   Man (XY)

Genotipe      :         X,Xh                                 X,Y

Fenotipe      :         XXh(carrier),XX(normal women)

                             XY(normal man), XhY (hemophilia).

So,if they married,they will have child haemophilia is 25%.