Not only are interviews in person, but many schools asked for a photograph. Granted, this was not always required, but it was asked. I don't know how much race factors into the selection process, but regardless of that issue it is impossible to withhold that information.
On a personal note, I think the photograph is an outdated idea. I know they ask so that they can "recognize" and "identify" you when you interview, but come on. It's illegal for employers to ask. They'll see you in the flesh when you interview anyway.
Also on a personal note, I think having to fill out your gender and race is outdated as well. Again, this is regardless of whether it affects anything. Again, they'll see you in person.