![]() Then there are genes that determine whether that base color is solid, or broken up with white patches. There are specific genes for the base colors of your cat’s fur. How The Tortoiseshell Vs Calico Pattern Is Created ![]() Females have two x chromosomes but males have only one, and so rarely have the pairs of tortoiseshell genes required for the pattern to be expressed. This is because the genes that causes the tortoiseshell and calico patterns are carried on the x chromosome. And the rare males that do occur are usually infertile. And the tortoiseshell and calico patterns have some unusual features.Ĭalico cats and tortoiseshells, also known as torties, are usually female.
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