Jutes and Kallikaks. I remember being taught about how research disclosed that over many generations, one family group produced a statistically significant preponderance of criminals, while the other family group produced a preponderance of law-abiding high achievers. I don't remember which group was composed of FReeper types...
LOL...you must be about my age. Like you, I had that in school too. They've long ago stopped teaching this as part of Bio classes.