Inheritance Pattern of Hemophilia

source:http://www.hemophiliafed.org/bleeding-disorders/hemophilia/inheritance/

The following diagrams show how the hemophilia gene can be inherited. It is important to note that in one-third of people with hemophilia, there is no family history of the disorder.

Mother is a carrier

• 50% chance that each son will have hemophilia.
• 50% chance that each daughter will be a carrier of the hemophilia gene.

Father has hemophilia

• All daughters will carry the hemophilia gene.
• No sons will have hemophilia.

Mother is a carrier AND
Father has hemophilia

• 50% chance that each son will have hemophilia.
• 50% chance that each daughter will be a carrier of the hemophilia gene.
• 50% chance that each daughter will have hemophilia.