Coat color and pattern is a polygenic trait, meaning it is controlled by more than one gene or gene complex. A dog with the gene for black color expression may also have the gene for suppression of black and so have a red or yellow coat. Or a dog with the brindle gene may have one or more of the genes for large areas of white and so have little or no brindle coloring visible. A dog with the dominant black gene may have genes for color fading and appear gray or merle.Rate This Answer
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