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Saikou · #6 (**permalink**) 14-01-2009, 11:36 AM

The silver is a colour inhibitor a separate gene to coat 'pattern' (maybe pattern's not the right word as its nothing to do with tabby). Silver is not a 'colour' recognised in siamese hence the registration. I would imagine it would be near impossible to tell a siamese with silver as there is so little colour to look at, therefore to ensure no silver siamese sneak into the main gene pool, they blanket say any siamese with silver in their pedigree within 5 generations (I think its 5 will have to check) has the potential to be a silver siamese, even though the silver is dominant. Even an oriental with silver in the pedigree is overstamped for such even if they are clearly not silver and as a gene it is dominant and can not be secretly carried.

The oriental coat pattern ie a self solid colour all over, colour not restricted to points only (C) is dominant, therefore if the cat has one of those genes that gene is expressed. The gene (cs) that restricts the colour to the points as for siamese is recessive and can be carried. For that gene to be expressed it needs a complete pair, one cs gene inherited from each parent. So for coat pattern and oriental not carrying siamese would have two C genes - CC
An oriental carrying siamese has one dominant C gene and one recessive cs gene - C cs
A siamese has two recessive cs genes - cs cs.

How far back is Mai Tai's silver ?