It’s easy to assume a cat’s coat pattern is based exclusively on genetics, but that isn’t entirely the case for Siamese cats. Their unique coloration comes from a combination of genetics, a fragile enzyme, and losing heat from little noses and toe beans.
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Sources:
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https://academic.oup.com/jhered/article/96/4/289/2187996
Newborn Siamese Kittens, Black Zero https://www.flickr.com/photos/zillay/7527277060
Tyrosinase https://commons.wikimedia.org/wiki/File:PDB_1js8_EBI.jpg
https://www.istockphoto.com/photo/out-of-the-darkness-gm171155833-1784004?clarity=false
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https://www.istockphoto.com/photo/domestic-siamese-kitten-gm508123785-45385724?clarity=false
https://www.istockphoto.com/photo/ginger-cat-gm1073475928-287351338?clarity=false
https://www.istockphoto.com/photo/grey-orange-and-white-female-cat-sitting-seen-from-the-front-looking-up-gm642447592-116789495?clarity=false
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https://www.istockphoto.com/photo/photo-of-the-siamese-kitten-gm629112884-111854829?clarity=false
https://www.istockphoto.com/photo/cute-color-point-kitten-with-blue-eyes-is-sitting-on-a-beige-sofa-front-view-gm1045364398-279746077?clarity=false
https://www.istockphoto.com/photo/full-length-shot-of-young-siamese-cat-gm526247763-52657010?clarity=false
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