Sui generis
Sui generis (; ) is a Latin phrase that means "of its (his, her, their) own kind; in a class by itself; unique."
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.