McMuffin. McMuffin is a nine-to-12-month-old female, blue-cream calico cat. She was found hanging out at the McDonald’s on the 4100 block of Morningside Avenue. The rescue says she’s a friendly and ...

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 ...