Factor that causes hemophilia

A person either inherits the gene or a mutation occurs (sporadic haemophilia) that causes one to have this condition. Take note here that one can have hemophilia even if his or her parents do not suffer from this condition due to a mutation.

TThe haemophilic gene occurs only in the X chromosome. Since the X chromosome decides the gender, it is also called as a sex-linked disorder.

Case 1 : The father has the haemophilia gene while the mum does not have. The son will not have the gene, but the daughter will. The daughter is called as carrier.

Case 2 : The father do not have the hemophilia gene while the mum has it. Every son will have 50% chance to suffer from this disease and 50% chance for the daughter to carry the gene.

Case 3 : The father has hemophilia and the mum is a carrier. There will be 50% chance the son will be hemophiliac; 50% chances that the daughter will be a carrier & 50% chance the daughter is a hemophiliac as well.

There is also some after-born hemophilia, but it can be solved via treatments.