There's one sure way to tell if it's a true mutation or a hybrid - breed four pairs from separate clutches. If all of the chicks look like the parents, it's a genetic mutation. If you get whites and pharaohs, it's a hybrid. A hybrid + a hybrid will never breed true more than 50% of the time. It can't.
Though if it's a white/pharaoh, sounds like a hybrid, since the whites aren't a double recessive but a masked autosumnal dominant.
-Spooky
Though if it's a white/pharaoh, sounds like a hybrid, since the whites aren't a double recessive but a masked autosumnal dominant.
-Spooky