 While some genes are more common in certain populations, there are no genes that exist in all members of one population and no members of any other.The first theory of eugenics was developed in 1869 by Francis Galton (1822–1911), who used the then-popular concept of "degeneration".He applied statistics to study human differences and the alleged "inheritance of intelligence", foreshadowing future uses of "intelligence testing" by the anthropometry school.