The "snow" gene is recessive.....
meaning that the breeding pair must BOTH carry the gene in order to produce a "snow" kitten.

For example:

We have Aramis, a brown spotted (bst) boy:

Aramis' sire is Abarron, a Seal Lynx Point:

Aramis' mother is Malha, a brown spotted tabby that does not carry either the recessive cs, or cb gene:

Because the breeding pair must both carry the recessive gene, and Malha does not, there can be no seal lynx offspring from this type of pairing.
Malha x Abarron litter...brown spotted,lynx carriers)
However, because the sire is a seal lynx point, all of the offspring will carry for it and when bred to another carrier, will be able to produce it.

Another example:

Happy is a bst. She is a slp carrier:

When bred to another bst who is a seal lynx carrier, Antonio:

We can anticipate a mix of browns and seal lynx:
When two "snow" Bengals are bred, the offspring can only be snows.
If a seal mink is bred to a seal lynx, the litter can be mink, lynx, or a wonderful mix of both, due to both cs and cb being present in both parents-
Mink mommy (bred to SLP male) and babies
If a seal lynx is bred to a seal lynx, only seal lynx will be produced.
SLP mommy (bred to SLP male) and SLP babies
The same is true for sepia.. if sepia is bred to sepia, only sepia can be produced. If sepia is bred to a seal lynx point, only Seal Minks can be produced.
If a Sepia is bred to a mink, only sepia or mink can be produced. A Sepia can never produce a slp, and a slp can never produce a Sepia.
If a brown female, who carries for sepia (cb) is bred to either a seal lynx male, or a brown male who carries the slp gene, we can expect a mix of brown and seal mink.
Brown mommy who carries sepia (bred to brown male, who carries slp) with her brown and mink babies
A simple and inexpensive swab test (DNA) can be done to determine if a cat is a lynx or sepia carrier.