Can cats be half Russian blue half tabby?

Before I answer, I feel it necessary to point out that a Tortoiseshell is not a breed, only a color variation.

But about the Persian thing, the only cats I know that came from the Persian are Himalayans, and the Exotics. Breeding a Persian and a Domestic Shorthair (moggy) whom has no pedigree would result in mixed-breed moggy kittens.