Ah, modern eugenics.
The popular field of DNA for genealogy (cousin-matching), extends and includes medicine/health aspects.
I understand 23 and Me, uses a detailed questionarrie about family health, in order to identify DNA "markers," that might correlate to medical conditions.
My next door neighbor is a 40-something fatherof four, lawyer, with a nasty blood cancer disease. He has been treated with stem cells (don't know any details).
My brother died at 37 from Leukemia. No match good enough for a marrow transplant was found.
Angel baseball player's daughter died of Leukemia a few years later. Her mother was Russian Jewish, and a huge search failed to find a transplant match for her.
I fully approve of DNA/genetics science for medical advancements and for saving peoples' lives.
It may one day be possible to learn from DNA tests, which diseases/disorders a person is at risk for earlier, and to implement treatments.
We already know a lot about IQ and stupidity, but I'll stay out of that, although there is ample science.