How much human variation falls within any population, and how much between “races”?
Richard Lewontin did an amazing piece of work which he published in 1972, in a famous article called “The Apportionment of Human Variation.” Literally what he tried to do was see how much genetic variation showed up at three different levels. One level was the variation that showed up among or between purported races. And the conventional idea is that quite a bit of variation would show up at that level. And then he also explored two other levels at the same time. How much variation occurred within a race, but between or among sub-groups within that purported race. So, for instance, in Europe, how much variation would there be between the Germans, the Finns and the Spanish? Or how much variation could we call local variation, occurring within an ethnicity such as the Navaho or Hopi or the Chatua. And the amazing result was that, on average, about 85% of the variation occurred within any given group. The vast majority of that variation was found at a local level. In fact, groups like th
