Torties get their distinctive coat color from genetics — specifically the X chromosome. Since coat color genes are carried on sex chromosomes, and females have two X chromosomes, they can express both orange and black fur.
Many female cats have this combination, leading to the classic tortoiseshell or even calico markings if white color genes are present.
What About Male Torties?
Male tortoiseshells are a rare case. Because males have only one X chromosome and one Y chromosome, they shouldn’t be able to express both orange and black fur.
But in incredibly rare situations, a male cat may have a genetic anomaly — XXY Klinefelter’s syndrome — which lets him display both colors. These male tortoiseshells are so unusual, they’re sometimes called money cats in many cultures, symbolizing good fortune.
