Barb, is it possible this bird had his head picked by other birds when he was younger and just feathering out? If so, there may have been damage to the feather follicles that is causing this now, but that would not be genetic. I sometimes have this happen with my young birds, but it is usually the tail that gets picked out, and that causes twisted feathers or mis-shapen tails when they get older. I have had it happen on their heads though, and sometimes it even leaves a bare patch of skin where there should be feathers. This spoils them for showing, but it would not be a problem in using them as breeders.