[Coyoteman]

Natural selection would produce a weeding out of light people in the equatorial regions and the dark people in the polar. Existing genetic material would be removed, and less genetic material would remain.

The genetic traits of the two groups would begin to diverge. You might call this microevolution. Given different environments and no contact this could grow to macro over time.

I don't see the removal of genetic material as being necessary here, only the change in genetic material. In other cases (sickle cell anemia, Thalassemia) there is an increase. But I'm a bones type myself, what do I know.

[Jedi Master Pikachu]

bye.