The torbie cats are rare, and they usually have tabby stripes, lines, or dots, along with black and brown/red tortoiseshell markings. Unfortunately, male cats with XXY Syndrome are sterile and often have serious health issues, resulting in significantly shorter lifespans than female torties. In cat fancy, torbie or tortie- tabby is a term used to denote cats with a tortoiseshell coat, having a patched tabby pattern. If a cat has any white in their coloring, even if they have a mixture of colors all over (black, brown, tan, red, amber, chocolate, cinnamon, etc.) they are referred to as a Calico cat. In 2014, a Scottish cat rescue welcomed tortoiseshell kitten Harry into the fold-a feat so rare it made the news. In very rare cases-about 1 in 3,000-a male tortoiseshell cat can be born with two X chromosomes and one Y chromosome. The embryo shuts off one X chromosome in each cell, resulting in orange and black color variations in their coats.īecause a male cat has one X chromosome and one Y chromosome, he'll only be orange or black-not both. The female sex chromosome (X) also carries the genetic code for orange or black coat colors the male sex chromosome (Y) does not carry information on coat color.īecause females have two X chromosomes, they have two sets of genetic information that can determine their coat color. That's because the same chromosomes that determine their sex also determine the colors in their coats. Instead, the Tortie term actually refers to the coat pattern that results from a certain genetic combination. Like the Tabby cat, the Tortie cat is not actually a breed. Like calico cats, you'll find most tortoiseshell cats are female. Tortoiseshell Cats are so-named for their tri-colored coats that resemble the colorful shell of a tortoise.
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