noun
dysgenics; cacogenics
A technical term in biology referring to the study of or the process of genetic deterioration in a population. Rare outside academic contexts.
劣生学は、集団の遺伝的質の低下を研究する分野である。
Dysgenics is a field that studies the decline in genetic quality of a population.
優生学 (eugenics) is the opposite concept, focusing on improving genetic quality, while 劣生学 (dysgenics) concerns genetic deterioration.
A compound of 劣 (れつ, 'inferior') + 生 (せい, 'life, birth') + 学 (がく, 'study'). The term is a direct translation of the English 'dysgenics'.