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How Should a Tortoiseshell Cat be Marked? 1 Citation In the most desirable tortoiseshell cats, the dominance of black is infiltrated with a fairly even spread of red and cream.The true tortoiseshell-patterned cat is quite rare and the incredibly high price for a pedigree reflects the rarity of its coloration.True tortoiseshell-patterned cats are almost all females, as the coloration is linked to the lack of an X chromosome. The few males that carry this beautiful coloration are often sterile, which causes problems for breeders wishing to develop t, technorati.com
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