Huh, that’s wild! I don’t know anything about the genes that control chocolate, but coral blue is two copies of the lavender gene with two copies of the partial dotting gene?I haven't seen any research concerning the shades of the purple neck coloring. It is possible that a darker coloring may signify the presence of two copies of the DSV gene (Dark Shade Variance).
Because of how I have produced Royal Purples, I do not believe the claims about what produces Royal Purples. My Royal Purples are produced by mating my Chocolate cock with a Coral Blue hen. In my opinion, this is not due to a mutation because it happens every year and multiple times. Their claim that Royal Purples have the dominant gray gene is not accurate in my opinion. Other than by mutation it is not possible for the Royal Purples that I produce to have the dominant gray gene.
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