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That is incorrect.
Dr. Stino studied quail captured upon arrival from Europe. Their plummage color was exactly like the Japanese Quail. He cross bred the two back and forth to create the birds we have today and the color mutations we have today come from the Japanese Quail that he...
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by hatching out a ton of chicks
I agree with this article a lot as many people "think" they create a mutation when it has been already created...makes it difficult in naming the variety. This is the most correct article there is right now.
British Range is the result of the presence of extended brown, the wild-type (which is the pharaoh variety), and red head genes to be exact That is why there are more shades in the plumage
The British Range contains the color gene "extended brown." It isn't the name of the variety, just the gene that determined it which is E
Does that make sense? I am trying to keep it simple
Edited to add: Your photo is an excellent example of the Dark British Range Variety Beautiful photograph
Here are some mutations for Genetics folks........
EXTENDED BROWN, E
Inherit: Autosomal Incomplete dominant
Linkage: Unknown
Characteristic: "this mutant color gene extends the distribution of black and dark brown pigment throughout the plumage. Both sexes appear the same"
Reference: Journal of...