Scientific studies & ideologies which supports racism:

Scientific racism also included the study of Darwinism, the culmination of human history, the ideology of Adolf Hitler etc was used in the scientific techniques and hypotheses to support or justify the belief in racism.

Racial inferiority, or racial superiority (the white race being superior over the other races), or alternatively the practice of classifying individuals of different phenotypes into discrete races, all such beliefs and ideologies were compiled up in this scientific study.
 
Though the study of scientific racism, it’s norms and cultural beliefs have been modernized by the scientist of the 19th century, but it’s origin derives from the ancient culture of Greco -Greece/Rome…
 

Prejudice transformed into political and social power:

 
The scientific study of racism took the prejudices which the European culture had towards Africa, Asia, and Red Indians, and transformed them into political policies, institutional doctrines, and social values that are upheld in the western society until today.
 
Scientific racism was common during the New Imperialism period (c. 1880s – 1914) where it was used in justifying White European imperialism, and it culminated in the period from 1920 to the end of World War II. 

Through the teaching of Darwinism, the ideology racism began to be taught and accepted in the western schools of the gymnasium, and to be spread in the colonized colonies of Europe.
 
Since the later 20th century, scientific racism has been criticized as obsolete and has historically been used to support or validate racist world-views, based upon belief in the existence and significance of racial categories and a hierarchy of superior and inferior races.