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

Fortunately, mom and fur mom @brittanyy192 knew exactly what was going on when the cat at her local vet clinic fell in love ...

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 ...

This is why most calico and tortoiseshell cats, which have a mix of black and brown fur, are female. In somatic cells, only one of the two X chromosomes is active, and as a result, the black and ...