In cats, tortoiseshell coat color appears in females. A tortoiseshell coat has patches of dark brown fur and patches of orange fur that each in total cover about half the body but have a unique pattern in each female. Male cats can be either dark brown or orange, but a male cat with tortoiseshell coat is rarely produced. Two sample crosses between males and females from pure-breeding lines produced tortoiseshell females. Cross I P: dark brown male × orange female F1: orange males and tortoiseshell females Cross II P: orange male × dark brown female F1: dark brown males and tortoiseshell females