This picture really confuses me though.
Mine being a hybrid of a Golden Cuckoo and a black copper should have 1 copy of the barring gene and be dark. This hen in the background is a cuckoo, and is showing the darkness of one gene copy, so why are these so much lighter? Is there varying shades of darkness in the dark cuckoos? The more I learn, the more I get confused, lol.
I asked a friend of mine about this that is very tuned in to the Cuckoos and the genetics behind them. This was her response......
"They will be varying shades until you choose for one shade. It also depends on the rate of feather growth and melanizers."
I asked her if the birds that feathered in faster were lighter than the slower feathering birds. Her response....
"It is just distributed better. The barring gene effects the way the color is put into the feather. It is like a switch turning it on to make black/blue/gold and off to make the white/silver. Like if you were spray painting and pressing the button once a second down a length of board. If you move your hand fast you have less color. Slower and you have more. The barring gene only works at one speed. The feathering rate determines the pattern. There are several genes related to the rate of growth."
Hope this helps a little.