Dilution gene
Dilution gene is a popular term for any one of a number of genes that act to create a lighter coat color in living creatures. There are many examples of such genes:
General
Diluted coat colors have melanocytes, but vary from darker colors due to the concentration or type of these pigment-producing cells, not their absence. Pigment dilution, sometimes referred to as hypomelanism, has been called leucism, albinism (perfect, impartial, or dilute), ghosting, paling, and isabellinism.
Albinism describes a condition where there is no color pigment
Leucism describes a condition that creates loss of pigment cells
Cats
Cat coat genetics discusses many dilution genes in cats
Horses
Equine coat color genetics discusses color genes in horses, including a brief description of dilution genes
Equine coat color describes various colors in horses
Cream gene, describes the process for horses by which the cremello, perlino, smoky cream double-dilute colors are created as well as the buckskin, palomino and smoky black single dilute colors.