The Thai Cat Center 

Thai Cat Genetics 

Thailand is home to a handful of unique mutations that result in the wonderful coat and eye colors we see in Thai Cats. Specifically, there is the dilute gene, the chocolate gene, the Siamese gene, and the Burmese gene.  Because these mutations can be inherited in all different combinations, Thailand is home to a kaleidoscope of coat and eye color

If you would like to know more about the specifics, click on the link below. 

So, you have several unique coat color genes, and depending on how you combine them, you can get radically different looking cats.