If a male cat is both orange and black, he is probably sterile. Both of these colors are carried on the female X chromosome that cats receive from their mother. Normal male cats only carry one X chromosome, so they can be orange or black, but not both. Under extremely rare circumstances however (1/3000), a male cat is born with an extra X chromosome (XXY), in which case it is possible for him to be both black and orange. This unusual combination of chromosomes, however, will almost certainly render the male cat sterile.