cats

Nah, just means the females are all homozygous for orange, and all the males are orange. The gene for orange is on the X chromosome, and since XY males only get one X chromosome, they're either "orange" or "not orange". XX females (and XXY males) can get one copy of "orange" and one copy of "not orange", and that's how you you get torties/calicos, and why torties/calicos are almost always female.