Tortoiseshell and calico describe a coloring found in
cats caused by a combination of specific genetic traits. In female cats, where this trait primarily occurs, it is a result of
X-inactivation, in which different patches of fur receive coding for different hair color due to the activation of an X chromosome from either the mother or the father. Calico coloring is a mix of
phaeomelanin based colors (red) and
eumelanin based colors (black, chocolate and cinnamon). Cats of this coloration are believed to bring
good luck in the folklore of many cultures ; in the
United States these are sometimes referred to as money cats.
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A tortoiseshell coat pattern that is also marked by one of the four tabby patterns. Also known as a "patched tabby."
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