The thing about human genetics is that it is the result of the merging of 8 human ancestors so race is an important effect on genetics. Although there is only one human species today, there is a wider genetic diversity than Richard has been willing to acknowledge. Elon's Martian colony is likely to widen human genetics diversity due to radiation effects.,(reply>), Elon’s Martians will be safely beneath a radiation shield, you might as well predict more diversity in Cornwall due to the radioactive granite.