Bone marrow??

In the episode of House M.D. this week they said it was harder to find a suitable bone marrow doner for a black person. Is this because black people dont donate as much as whites or because of something genetic? I asked my biology teacher and she didn't knowBone marrow??
Bone marrow matches are found on a 6-marker-antigen. Since in most places in North America are majorly populated by white people, there are less black bone marrow donors on the Registry. Certian factors are matched such as blood type for suitable bone marrow donors for a patient. Finding a bone marrow donor of the same race is more effective because they could have similar characteristics, such as blood type.
So, to answer your question in short form: Since black people are a "minority" in most places in North America, there are less black bone marrow donors in the registry. And, if a match is made between two people of the same race, it's more likely to be a successful transplant because their genes would have more in common.
it depends on the individual's attitude and will to donate one of his/her organ after death so that others may save their lives getting those but somebody ,most of us rather is unwilling to donate those even after death,it's not a question of black and white,question of extreame nobility,and yes there is ofcourse some genetic cause of matching tissues,cells.blood groups ,rh factors or other parameters