Thanks loureyes, np on the slight derail...I may come across like a crotchety old man at times, but I truly don't mind answering questions.
Trust me I know it's hard to find info on the net. You really don't want to know how many man hours I've put into studying fertility & sb questions concerning hybrids.
Many things I discovered about the sb gene (as known in bp, fh etc.) were due largely to test breedings I've conducted. I'm still learning, but one thing I do know for sure, it always shows up in the first gen, usually in large numbers, I put it at the 50% mark. I've heard some people claim different results..but three test runs later I'm convinced.