Tonkinese Genetics can get very complicated especially with the different colour variations and with the genes that the male or female Tonk are carrying. These genes will determine coat and eye colour which is pointed out on the Tonkinese colour page.
Mating different colour variations will determine what colour the kittens will be and the genes that kitten will carry. This will in turn determine the specific colours that will be in their off spring.
If you are interested in reading further on the Tonkinese genetics click on this link http://www.tonkinesebreedassociation.org/tonkgenetics.html