[dekaybrown]

I would almost have to think as a guess, most likely if it were to breed, in short order, a couple generations later, the gene would be diluted out.

Here is a simple scenario, I can see it happening. If I were to purchase a pair of red sided, and they bred, I released the babies into my yard, where they are not native, yet the climate will sustain them, they would survive and adapt.

At the conclusion of winter, by pheromone identification, the siblings will most likely find one another and breed.

If one confused red were to successfully impregnate a local eastern, (I'm not even sure it will work, Scott Felzer knows what ones will actually cross) and a litter were born, they would be very interesting mutts.

I have to assume In time, the "Introduced" gene would fade.