The vast majority of tortoiseshell cats are female, because two X chromosomes are required to produce black, gold and orange coloring. Male cats only have one X and one Y chromosome, so technically it’s genetically almost impossible for a male to inherit the tortoiseshell coloring. A male tortoiseshell has an extra X chromosome, making it an XXY. According to a study by the College of Veterinary Medicine at the University of Missouri, only 1 in 3,000 tortoiseshell cats is male. Due to the chromosome imbalance, male tortoiseshell cats are (usually) sterile.
This is not the case with MezzoMixx, a stunningly gorgeous almost 3-year-old Maine Coon. He lives with Carina in the German state of North Rhine Westphalia. Carina breeds and shows Maine Coons because she loves the breed*. All cats are members of the family and have access to all areas of her home.
When Mezzomixx, whose full name is “Witches MezzoMixx Fantaghiro of Loveliness,” was four months old, Carina realized that the cat she thought was female turned was actually a male. And while male tortoiseshell cats are usually sterile, MezzoMixx is not. Tests performed at the University of Veterinary Medicine Hanover confirmed that MezzoMixx is a XY/XY chimera. I have to confess that genetics makes my head explode, but Carina provides a detailed information about MezzoMixx’s genetics on her website (you’ll have to run it through Google Translate and disregard the unfortunate translation of Kater. “Kater” is German for “male cat,” but it’s also the German word for “hangover.”) Open Next Page Below To See More