Prenatal testing is one of the few solutions to this "post-darwinian" world (not in the usual sense of the word) with its modern medicine that will result in mankind accumulating more and more genetic defects. Though slightly more ethical from my point of view would be gene-editing to remove those defects, instead of just terminating the fetus. Edit: Also I'm not talking about down syndrome specifically. There's a lo…
It's seems intuitive to me that as we are able to solve genetic defects with modern medicine, we'd begin seeing more and more of them. I imagine even bad teeth, or poor eyesight would have greatly reduced one's likelihood of surviving and reproducing in our not so distant evolutionary past, let alone something like Type 1 Diabetes, or a chronic heart condition.
That of course is just speculation though. Does anyone know of any studies indicating one way or the other? My quick search wasn't able to turn anything up.