If that’s the case it should return if we stopped fishing.
No. A certain gene expression can just be gone forever. Nothing guarantees the desired expression will evolve again.
https://en.wikipedia.org/wiki/Hysteresis
Not always the case. Any number of things can happen that could prevent that from happening, like extinction, as an extreme example.
No. A certain gene expression can just be gone forever. Nothing guarantees the desired expression will evolve again.