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Calico Cats


Frank Calico Cat
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"Tortie and calico cats are nearly always female. About one in 3,000 calicos is male, and is usually infertile -- in fact, only 1 in 10,000 tricolor males is fertile. This is because the O gene that carries the red or orange coloration is carried only in the X chromosome, and males have XY chromosomes. So a male cat with the O gene often ends up an orange tabby. Females get two X chromosomes, and a female with two O genes will also be orange, which is relatively rare. However, an orange gene and a non-orange gene on X chromosomes creates a calico or tortie cat."

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