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If that's his mother, what rooster did you have that would hang that large comb and wattles on him? Knowing the breed of his sire might help determine what he's carrying. There are at least three whites; recessive, dominate, and silver.................... plus a another thought to exist by some but still unproven. He may carry one copy for recessive, but he's surely not pure for recessive or dominate IMO and possibly no dominate at all. With the corn/sun yellow showing in the one pic, not pure for silver either. The thing making it even more difficult is that all three can exist in the same bird, whether pure for one or more or not pure for any.
Sorry I forgot to mention his father, his father was a Buff Orpington. I bought his mother from a neighbor who if I remember correctly, got her from Cackle. Underneath all his hackle feathers he has black columbian like markings. I am assuming he carries recessive white.
My partial grasp of color genetics leads me to believe he is black patterned silver columbia, just by his apperarance, but impure for it. I'm not sure if the lemon colored blush is from his buff heritage, or just corn/sun yellow showing because there is only one copy for silver. Pure silver, I think, usually completely blocks red or gold bleed and does not yellow out from corn being fed or sun exposure.
ETA: Of course this means his mother must be a silver columbia with some other patterning gene present to cause the scattering of black on her back