This goes back to me calling DS corrupted. I say this because that, which is selected for in DS, is what humans regard as desirable; this is not the same as naturally advantageous.
One thing that "domestic selection" or breeding programs frequently do is back breed with other stock to (a) reinforce a trait common to both, and (b) introduce some additional genetic variation into the program (see
hybrid vigor).
This also happens to reintroduce gene flow between populations and thus prevents speciation.
Enjoy.
Edited by RAZD, : and
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