I got to thinking today (NO, I didn't hurt myself
) and wondered what would I get if I cross a chicken with blue with a chicken that had dun. Both affect the black gene, but I don't know which would be the more dominant. I also wonder what would happen if the genes were together in various combinations, and what I could expect to get if I crossed any offspring with a normal colored mate. I'm sure there would be blues as well as duns and normal colored offspring. Just food for thought...
