Genetically, two black people are more likely to be more different to each other than a black person and a white person. In other words, while the physical differences are clearly visible between a white and a black person, the total amount of difference is much smaller than between two black people. If everyone on Earth was wiped out except for one of the traditional racial groups, say, eastern Asians, we would still preserve 85 per cent of the genetic variation that humankind bears.
