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So... I'm working on some post-apocalyptic material and doing research into genetics, population decline, etc. I basically have a human population isolated on a single planet with sustainable resources. Does anyone have any opinions on the number of individuals needed for the population to survive? I killed off most of my population with mass disaster and limited the birthrate with some funky genetics causing a slow population decline. But, I want to make certain, when the birthrate does pick up again with my sneaky genetic plan, I have enough genetic diversity to sustain a species and prevent too much genetic drift leading to an "unhealthy" and ultimately non-viable population. I have a method to induce a few dozen new individuals with completely different genetics, but otherwise- how many do I need? I glanced at the equations, but to be honest, I'm not sure how to calculate something like this. Any thoughts? Oh- and I need to kill off at least a few thousand in wars, too, so I at least need a decent fighting force! thanks for any help!!!