The origin of the Bengal breed began with the cross between The Asian Leopard Cat (ALC) and the domestic cat. Some of the early felines used in these matings include Egyptian and Indian Maus, Burmese and non-pedigreed domestic cat progressed, SBT Bengals were taken back to the Asian Leopard Cat instead of the misc. other breeds. The first three generations resulting from the ALC x Bengal are considered "Foundation Bengals". The terminology regarding the early generation Foundation Cats can become somewhat confusing for even the most experienced Bengal enthusiast.
The term "filial" comes from the Latin word filius or "son". The genetic meaning of the word filial is "of or relating to a generation or the sequence of generations following the parental generation" (The American Heritage© Dictionary of the English Language, Fourth Edition, Copyright © by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.) Bengal breeders refer to F-1 as the first generation cross between the ALC and the domestic Bengal. The F-2 is the second generation cross (the offspring of the F-1 and the domestic Bengal). The F-3 is the third generation (the offspring of the F-2 and a Bengal).The International Cat Association (TICA) considers the fourth generation (F-4) to be a "SBT" (studbook tradition) Bengal, eligible for competition in the show ring and a fully accepted domestic cat. http://www.tibcs.com/aboutbengals/foundation.aspx