Eugenics

"Eugenics is the "applied science or the biosocial movement which advocates the use of practices aimed at improving the genetic composition of a population," usually referring to human populations."

Wikipedia.

Government Advisory Panel: Test children's genes before they have sex.

Children should be encouraged to undergo genetic testing before they become sexually active to check whether they could pass on “hidden” abnormalities to their offspring, a government advisory group will say this week.

The Telegraph.