I just put up a sale for my BBS Plymouth rock chicks if anyone is interested. About half of them are Blue Barred!. I was confused at first about the genetics, thought I would get all barred chicks from the barred roo over blue hens. But, because he has only a single barring gene, I got blue, black, and blue barred. I could have got black barred as well, but it looks like I didn't. Not sex linked. Question - one of the blue barred has a much bigger head spot than the others - does this mean anything?