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.
History of eugenics
Eugenics eventually referred to human selective reproduction with an intent to create children with desirable traits, generally through the approach of influencing differential birth rates. These policies were mostly divided into two categories: "positive eugenics", the increased reproduction of those seen to have advantageous hereditary traits; and "negative eugenics", the discouragement of reproduction by those with hereditary traits perceived as poor. Negative eugenic policies in the past have ranged from paying those deemed to have bad genes to voluntarily undergo sterilization, to attempts at segregation to compulsory sterilization and even genocide. Positive eugenic policies have typically taken the form of awards or bonuses for "fit" parents who have another child. Relatively innocuous practices like marriage counseling had early links with eugenic ideology. Eugenics is superficially related to what would later be known as Social Darwinism. While both claimed intelligence was hereditary, eugenics asserted new policies were needed to actively change the status quo towards a more "eugenic" state, while the Social Darwinists argued society itself would naturally "check" the problem of "dysgenics" if no welfare policies were in place (for example, the poor might reproduce more but would have higher mortality rates).