It might be a little OP but it would be cool to see! Have a Gene/trait swapper potion sold in the diamond store and with it your able to swap a gene with another on the same line.

For example:

Pet has
Gene 1: Shadow Markings
With the potion you can change it to:
Gene 1: Tribal Markings

You can not however change Gene 1 to a gene 2. You are only allowed to swap a gene on the same line.

Also you can have extra restrictions like can only be used once on a pet and only on captured pets. However it shouldn't share the lockout with genetic mutators. So you can use both a genetic mutator and a gene swapper.

It would just be a nice addition when your hunting so much for the right pet or the genes you want but you only ever manage to find one of them etc.

I like this idea!