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Hemophilia is passed down from mother to son. It is extremely

rare for a woman to have hemophilia. It is necessary, though, for

a woman to be a carrier of the disorder for her son to acquire this

disorder. 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. Therefore, he

can only get hemophilia through his mother.

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.

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14y ago

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