"A bitter debate in the early twentieth century between "biometricians" and "Mendelians" about how best to study seemed to end in a victory for genetics, defined by a focus on discrete nuggets of hereditary causation for which in 1909 coined the term "." The new genetics emphasized , , and s. Despite geneticists' intense engagement with eugenics and medicine, Homo sapiens was not their preferred organism. It was too resistant to laboratory manipulation and had too long a generation time in comparison to , s, and viruses."