03/09/2026
Orange fur in cats is linked to a gene carried on the X chromosome. Male cats have only one X chromosome, so if they inherit the orange gene, they will usually be entirely orange. Female cats have two X chromosomes, meaning they can carry both orange and black genes at the same time. This combination creates mixed coat patterns like tortoiseshell or calico, where patches of orange and black appear together. Because of this genetic difference, most orange cats are male, while most tortoiseshell and calico cats are female.
