Genetics Picture

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Some alleles are not only dominant over other alleles belonging to the same locus but they also obscure the effects of other genes. Or maybe it is recessive towards another allele on the some locus, but still obscuring the effects of any allele in another locus. This is called epistasis. One example of this is the gene for white in cats, W. This gene is epistatic to all other genes for coat color - whether the cat carries genes for black, blue, red, agouti or spotted, it will only be the white color that is showing.