Answer
Jack has hemophilia --most likely hemophilia A. . Consequently, his blood has a deficiency of the clotting factor Antihemophilic Factor A, which is made by the liver. The gene for this inherited disease is known to be carried/transmitted on the X chromosone . Therefore, hemophilia is what is known as a sex-linked-- or more accurately-- an x-linked disease.
Jack is a male, so he got a Y chromosome -- not an X chromosome-- from his father. His X chromosome, with the hemophilia A gene, was transmitted to him by his mother.
Work Step by Step
Note. Function of the antihemophilic factor is to activate Factor X in the intrinsic coagulation pathway.
