Domestic cats are also good examples of two genetic phenomena: Siamese cats can have white fur but dark paws and face, it's because of a temperature sensitive

Domestic cats are also good examples of two genetic phenomena: Siamese cats can have white fur but dark paws and face, it's because of a temperature sensitive mutation enzyme. Tortoiseshell cats are usually female, and the patterns in their fur are a result of X-chromosome inactivation happening in random clumps of cells.