How do with Hemophilia donate blood?

Hemophilia is normally passed down from mother to son through the X chromosome. Females have two X chromosomes whereas males only have one. When a boy is born, he takes one X chromosome from his mother and one Y chromosome from his father.

Example One:

Mother(Carrier)+Father(Non-Affected)=50% chance of their son

acquiring the disorder and 50% chance of their daughter being a

carrier.

Example Two:

Mother(Non-Affected)+Father(Hemophiliac)=All sons will be

non-affected and all daughters will be carriers.

It is also important to note that approximately 1/3 of the cases of genetic hemophilia are results of random mutations where no prior family history existed. Of course, these new cases can pass the mutations on to their children as well.