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/sci/ - Science & Math

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4619730 No.4619730 [Reply] [Original]

Can anyone tell me why most of the world has black colored hair?

And where did fair skin and colored hair come from?

>> No.4619744

http://en.wikipedia.org/wiki/Human_hair_color#Genetics_and_biochemistry_of_hair_color

http://en.wikipedia.org/wiki/Human_skin_color#Genetics_of_skin_color_variation

>> No.4619745

>>4619744
So you don't really know, then. Or are you capable of explaining the concept using your own words?

>> No.4619750

don't really know

but im guessing its something to do with the pigment and Vitamin D, the more north you go the less protection you need from the sun?

>> No.4619757

Perhaps black hair is the dominant gene? I'm not sure.

>> No.4619760

To go with the last user, it can come based on a lot of factors; chemically, socially, and genetically.

Black hair pigment is chemically stable, and quite an abundance of the world population intermingles with the dominant black hair trait.

This all coupled with where people usually settle in the world, and you can probably make the distinction of what the majority of hair color can be per region of the world.

>> No.4619762

>>4619745
I'm chastising you for being really fucking lazy and helpless.

>> No.4619766

>>4619750
Vitamin D is skin colour.

Black hair protects the brain from UV.
Black (or dark) hair is common, because people tended to live outside.

>> No.4619769

Fair skin is mostly due to the cultivation of cereals in Europe, a result of warm Mediterranean outflows. Light hair is a byproduct of this. Basically, eating more grains means you're eating less meat, which means you get less vitamin D. In northern climes, you don't make enough via your skin if you have a lot of pigment, so darker pigments evolved away.

There are actually very few genes which contribute to pigmentation.
> http://blogs.discovermagazine.com/gnxp/2009/03/genetics-of-human-pigmentation/

>> No.4619780

>>4619769
diet?

diet is responsible for the current racial tension embroiling the west?

>> No.4619790

>>4619780
Well... idiocy is primarily responsible, with a touch of self-entitlement and a dab of religious zealotry.

>> No.4619792

>>4619790
Right, though cultural differences, herd safety and several other factors play parts in all this.

>> No.4619799

>>4619757

Hair color isn't as black and white as dominant or recessive genes, unless you're talking about red hair. Red hair is recessive and non-red hair is dominant.

>> No.4619804
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4619804

>>4619790

>touch of self-entitlement
>a dab of religious zealotry

More like these are the MAIN factors. Religious zealots demanding shit that they think is theirs and they refuse to compromise because they think their god promised it to them.

Everything else is a smokescreen.

>> No.4619822

Blonde hair is uncommon because it is special.

Blond master race here.

>> No.4619839

>>4619822
Blonde hair does not absorb UV. Practical use of blonde hair seems nill was only made possible by supporting environmental factors.

>> No.4619846

>>4619839
no, it reflects UV away from itself

>> No.4619861

>>4619846
Rather, it lets UV pass through.

>> No.4619870
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4619870

>>4619766
>Black hair protects the brain from UV.

the fuck am I reading?

>> No.4619898

>>4619870
Eumelanin absorbs UV and high frequency visible light.

>> No.4619915

>>4619898

Which would otherwise go through your scalp, skull, and into your brain?