What you mean, I think, is the thing about the extra tendon in the legs?
It could be traced back a long way to early human development, and the necessities/usage of such tendon in the humans who left Africa was less and probably went away with time.
When you're out in the cold parts of the world, you'll need more body fat and hopefully have more hair. In the scorching heat, dark skin will help against burns from the sun, less hair will mean better ventilation of the pores and absortion of the sun due to lack of hair blocking it, and the hair is very curly to help ventilate well the head in the heat. Then Africans were sent all over the world, mostly due to slavery, and what we have today is a mix of people from different backgrounds and blablala. That's why Lewis has a lighter skin shade and so on.
But yeah, nothing to do with F1, it's not running by yourself :P