Genetics Picture

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The gene for dilution

The dilution gene causes a modification so that the color becomes lighter. This is because the pigment granules are forming clumps. To the eye the coat looks lighter, in the same way as a mixture of black and white grains of sand look grey. The allele for dilution is recessive. It makes a black cat blue and a red cat cream. A brown tabby cat becomes a blue tabby.

Denominations: D = non-dilution, black/red
               d = dilution, blue/cream