How can you tell he is a duck wing? He was supposed to be a Wheaten marans/NN cross. His brothers hatched from Marans eggs and were supposed to be pure Wheaten marans, but they all had white heads so I sold them already. I don't think there is anyway the dad to the chicks was a Wheaten marans. The hen he is out of was black and white.
It's the white triangular area on his flight feathers.
Copper marans are crowwinged... their flight feathers are solid black. Wheaten marans are duckwinged- except their patch is red or tan.
Overly simple explanation- it refers to two different groups of the genetic base for patterns. There are two separate crow wing genes(gene notations: E, Er- extended black and birchen, respectively) and the duckwings are eWh, e+ and eb- wheaten, wild type, dark brown respectively.
Your roo would be expected result of a gold bird and a silver bird mating... this makes goldEN roosters. The gold gene makes for black and brown or red chickens, silver makes black and white chickens.
For example, the only genetic difference between buff and light brahmas is the former is gold, and the latter silver. Likewise for red duckwing and silver duckwing.
Golden is the name given to roosters that are genetically half silver and half gold. For reasons I don't know, sometimes they are black, white and gold colored.. rather beautiful color combination. Other times they are straight up black/white or grow up b/w and get a little yellow on the saddles or necks.
So "duckwing" doesn't exactly refer to a single gene... it refers to the roosters having that patch. Yet the wild type is regularly called red duckwing.. the hobby is full of confusing terminology.
Silver is sex linked, so hens cannot ever be golden, they can only be gold or silver. Your roo is proof of this- gold wheaten roo over a silver hen= golden or silver looking roosters and all gold hens.