EXCERPT: According to Paul Wolff Mitchell, an anthropologist at the University of Pennsylvania, "[Morton's race theory] had a lot of influence, particularly in the South."
Morton's pernicious legacy stemmed from the lack of scientific knowledge at the time regarding human DNA and how physical characteristics are passed on from one generation to the next.
https://discover.hubpages.com/literature/The-Science-of-Race-and-the-Metaphor-of-Color