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You can in the description if you want, but other players aren't bound by that.

I understood what you meant. No, there is no way to officially define genetics for a breed, like with check boxes/dropdowns like the search has. All you can do is write what colors/genetics the breed should ideally be in the description. You don't need the game to restrict the colors allowed if you are the only player breeding it, but if other players breed your breed, they don't have to follow the description, and there's no way to make the game force them to.