Men only have one dominant allele. Women have two dominant alleles. If one X chromosomes carries the dominant gene, the recessive gene on the other X chromosome will protect the woman from hemophilia. The gene does not affect women, but they carry it and pass it on to their children.
For instance:If a woman is a carrier, there is 50% chance that her sons will have the disorder. There is also a 50% chance that her daughters will be carriers of the disorder. This is if the womens partner ist hemophiliac.
For instance: A man that has hemophilia has a 100% chance that his daughters will be carriers of it, since they inherit the dominant x chromosome from the father. Therefore, his sons will not be affected by it if the mother is not a carrier.
