posted on Jun, 8 2017 @ 03:42 PM
originally posted by: WUNK22
So is blond haired blue eyed white peoples the furthest point so far in evolution??
The white skin is an evolutionary advantage (what you might call "the furthest point so far") only for people who live in geographic regions where
there is relatively less sunlight than other regions. Light skin would be an evolutionary disadvantage in sunny equatorial regions, where "dark skin"
would be the "farthest evolutionary point so far" for skin color in that region.
Humans need vitamin D, and most humans got vitamin D through sunlight. However, too much sunlight could also cause other problems, so these early
humans living in the equatorial regions had more melanin. It was a good balance between getting enough sunlight to produce Vitamin D, but not getting
so much sunlight as to be otherwise harmful.
Then Humans moved to other regions -- such as northward and into Europe. There was less sunlight there, so the babies who would be born with the
genetic mutation for lighter skin would actually have a genetic advantage (more Vitamin D) than the dark-skinned children. While back in Africa or
other equatorial (sunny) regions, this light-skinned mutation would be a Disadvantage, and fewer of those light-skinned children would live long
enough lives to have more children of their own. However, in Europe and other northern regions, this means more of the children born with the
light-skinned mutation would live longer and reproduce more -- and pass that light-skinned gen along to the next generation.
Do this for "N" number of generations, and the advantageous light-skinned mutation could spread through the population. The number of generations
depends on the population size of the region in question.