cold survival

By admin, February 20, 2010 8:08 pm

Is there a survival benefit for human to evolve blond hair?

Blond hair may look better, but I think brown or black hair can insulate the head better against the cold because they’re so much thicker.

Yeah blondes are considered more attractive so they get laid more which leads to more babies lol

Fair hair and skin could have a number of evolutionary explanations:

Creating pigment costs energy, so in locations where pigments are not needed due to low amounts of sunlight, natural selection favors those that use their energy for something else.
Another related explanation is that fair skin/hair increases the amount of sunlight that reaches the skin, and thus the amount of vitamin D that is created in the skin. Vitamin D is especially important during pregnancy and infancy, so this rhymes with why children typically have fairer sking/hair then they do as adults (especially those of northern european desent)
In addition to this there may actually be something to the “blonds are hot” argument. It is a matter of personal preference but if a large number of males are even slightly more attracted to blonde woman over an otherwise identical brunettes then they over time will be favoured for reproduction which would result in an increase in the frequency of the alleles in that population over time.

Lots of animals have very strange adaptions that dont help them to survive at all but increase their sexual selective success.
I think it is a combination of factors brought about by evolving in a northern climate. Skin pigment definately provides a large survival bennifit depending on where you live. I wouldn’t be suprised if the same mechanism wasnt responsible for hair pigment as well

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