Did you know that there is no such species as a Royal White Bengal Tiger?
The truth of the matter is that they aren't even pure Bengal tigers, but rather are all the offspring of an original Siberian / Bengal cross breeding. The inbreeding results in many defects, Immune deficiency, scoliosis, cleft palates, and mental impairment , early deaths, still births and, as could be expected, the cats are not very bright which is why they are preferred for entertainment purposes. The result is that they live shorter than normal lives.
The white gene that causes the white coat of a tiger is a double recessive allele.