Dave Haddock · Narrative Director

I covered that a little bit in the writer's guide. I'd gone with the Gattaca approach, where initially they cut down on a lot of pre-existing conditions that they could. So there's a certain aspect of genetic modification. Again, it doesn't feel like that's our universe, in a weird way, because we don't want it to get super weird. But again, I don't know. It's still kind of up in the air.

Will Weissbaum · Lead Writer

It's fairly limited. I think we're going with the problems that arise from too much genetic modification: generationally, you start seeing these issues spring up. They quickly identified that if you start messing with DNA too much, either you end up with homogeny, which is a big issue for the human race as a whole, or you start getting these unintended side effects a couple of generations in. I think it ended up being a little more controlled and limited to making sure that these diseases were wiped out or nipped in the bud. I think a lot of times you end up having later-in-life gene stuff happen, or lab-grown body parts or organs and stuff like that coming down the road, and that's where medical science headed, versus trying to build the perfect human in a lab through genetic modification.