However, some descriptors of cats are not actual breeds. Both tortoiseshell and calico fall into this category. They are not ...

A prime example of X inactivation is in the coat-color patterning of tortoiseshell or calico cats (Figure 1). In cats, the fur pigmentation gene is X-linked, and depending on which copy of the X ...

Conversely, calico or tortoiseshell cats are usually female – the female’s extra X chromosome allows the possibility of her receiving both a black and orange gene. 1. https://be.chewy.com ...