The Ancient Origins of Both Light and Dark Skin
A study of diverse people from Africa shows that the genetic story of our skin is more complicated than previously thought.
Few human traits are more variable, more obvious, and more historically divisive than the color of our skin. And yet, for all its social and scientific importance, we know very little about how our genes influence its pigment. What we do know comes almost entirely from studying people of European descent.
To Sarah Tishkoff, a geneticist at the University of Pennsylvania, that’s a ridiculous state of affairs. “It gives you a very incomplete perspective,” she says.
To redress that imbalance, Tishkoff and her team looked to Africa—the continent where humanity is at its most physically and genetically diverse. They recruited 1,570 volunteers from 10 ethnic groups in
