And because this large range of characteristics among individuals who nominally belong to the same race exceeds the difference between a few selected individuals who nominally belong to different races, we should ignore the average differences between the races as a whole. But what this argument really tells us is that we need to do quite a bit of racial housecleaning to make up for some of the dysgenic practices of the past few centuries. It should not convince us that there's no difference between Swedes and Haitians. It is also good to look a little more carefully at what genetic variation means. Much of our genetic makeup goes into providing for the basic, bodily functions of life.
All mammals have a great deal in common genetically.
All warm blooded animals have cells in their body nourished by blood, and they have many of the same biochemical processes going on inside them. A lot of our genetic makeup goes to provide for these basic functions. When it comes to genetics small differences mean a lot. However, no one would argue that this means that there is no significant difference between a poodle and a pit bull. The point is that these propaganda statements of the egalitarians are specious.