It's true. The chromosome for color on cats is carried on the X chromosome and since only female cats have two X chromosomes, only female cats can have three colors. Male cats have only one X chromosome, so they cannot.
True. Usually the sterile cat will have two X chromosomes AND a Y chromosome, making a calico or tortoiseshell male. And since their sex chromosomes are screwy, they're almost always infertile.
I think this post is only referring to calicos and tortoiseshells. Besides, isn't the brown on Siamese cats and Ragdolls just a transition color and not a "proper" color?
3/4 ginger cats are male. The orange gene is on the X chromosome and a male needs only one to be orange. Female cats, however, need two copies to be orange so they're more uncommon.
It's a bit more complicated than that, because colour is sex-linked in cats. Since the gene is on the X chromosome, males only get one copy of a colour gene while females get two, so males will just be the colour of their one gene while females can be mixed. But yeah, for a female cat to be pure ginger she needs the orange gene on both her sex chromosomes
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