Sui generis
In sociology, the "sui generis" is what has been externalized, then internalized in the overall public and becomes a part of society that simply exists in its construct. It is not something that is not thought to have been created, because it is imbedded in everyone's way of thinking and being. Instances include the idea of love, or going to school, or clothing belonging to a specific gender. These examples are "sui generis" for they simply exist in society and are widely accepted without thoughts of where they come from or how they were created.
Eugenics
Eugenics (; from Greek εὐγενής "eugenes" 'well-born' from εὖ "eu", 'good, well' and γένος "genos", 'race, stock, kin') is a set of beliefs and practices that aims at improving the genetic quality of a human population by excluding (through a variety of morally criticized means) certain genetic groups judged to be less desirable and promoting other genetic groups judged to be superior. The exact definition of "eugenics" has been a matter of debate since the term was coined by Francis Galton in 1883. The concept predates this coinage, with Plato suggesting applying the principles of selective breeding to humans around 400 BCE.