RE: Breeding question
If the Russian Black grandparent is on the Abyssinian Black Silver side, you have no chance whatsoever to ever obtain Russian Black unless the Red and White Tabby happens to carry it.
If the Red and White Tabby has a Russian Black grandparent, there is about a 1 in 8 chance the Red and White Tabby actually carries the Russian Black gene. So, if you win the 1 in 8 odds, you should get Russian Black about half the time. Net odds, for all possible cases, with an infinite number of pairs like this, is about 1 in 16.
