According to Jonathan Marks, By the 1970s, it had become clear that (1) most human differences were cultural; (2) what was not cultural was principally polymorphic – that is to say, found in diverse groups of people at different frequencies; (3) what was not cultural or polymorphic was principally clinal – that is to say, gradually variable over geography; and (4) what was left – the component of human diversity that was not cultural, polymorphic, or clinal -was very small.
Jonathan Marksi järgi jõudsid antropoloogid ja geneetikud 1970ndateks seisukohale, et 1) enamus inimerinevusi on kultuurilised; 2) mis ei ole kultuuriline on peamiselt polümorfne, st esineb erinevates inimgruppides erineva sagedusega; 3) mis ei ole kultuuriline ega polümorfne on klinaalne, st sujuvate üleminekutega geograafiliselt varieeruv; 4) ülejäänu, ehk inimeste mitmekesisuse see komponent, mis ei ole kultuuriline, polümorfne ega klinaalne, moodustab väga tillukese osa inimerinevustest.