September 30, 2013   373 notes

   Due to colour being expressed by the X chromosome, tortoiseshell (black & orange) cats, having two colours, always have two X chromosomes - they’re female - except for in cases of genetic chimerism.

   However, there’s a flipside to this that is less commonly mentioned: because of the female’s ability to express both colours at once, she can only be pure orange if she is not also carrying black. This means pure orange cats (with or without white) are more likely to be male.

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    This is cool! My Dinah is a tortie :)
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    Ginny and Billy.
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