Answer;
-Hemophilia
Step-by-step explanation;
-Hemophilia is a rare disorder in which an individuals blood doesn't clot normally because it lacks sufficient blood-clotting proteins (clotting factors).
-Hemophilia is an X-linked genetic disorder, which means that it's passed from mother to son on the X chromosome. If the mother carries the gene for hemophilia on one of her X chromosomes, each of her sons will have a 50% chance of having hemophilia.