An XLA patient will pass on the gen

An XLA patient will pass on the gene, and all of his daughters will be XLA carriers, meaning that any male grandchildren from an XLA patient's daughters have a 50% chance of inheriting XLA. A female XLA patient can arise only as the child of an XLA patient and a carrier mother. XLA can also rarely result from a spontaneous mutation in the fetus of a non-carrier mother.