Afrear being quite sure that the conqured populations all fight to the death and is repopulated by your soliders in Galciv2, and asking people to make sure it happens (it does). I would like to say that it is imposiabled for this because people can, hide, join you, surrender, evac of planet, pretend to join you or any other to surive use your imagination. This is how I think the civs would do when they conqured a planet populations.

                                                 Korath: kill them all, no exeptions.

                                                 Drengin: Kill alot of them, make the rest into slaves

                                                 Your: Kill alot, make the rest into ther ungodly experimetns.

                                                 Korx: Kill some to maintain order, use the rest for what makes the most money.

                                                 Kylx Jihad: Kill all the people how dont convert.

                                                 Torians: does not kills civialans on purposr, but will kill drengian civialans.

                                                  Terran aliance: avoids killing thr populaten.

                                                  the rest of the good or neutal civs do pretty much the same as the terrans or torians.