Darker Skin Evolved To Reduce Cancer Risk

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Post by Guest on Wed Feb 26, 2014 8:49 pm

A long-discounted theory about the evolution of skin color may have had it right all along, new research suggests.

Darker skin gives individuals much greater protection from UV light-induced skin cancer. Pale-skinned people are roughly 1,000 times more likely than individuals with dark skin to suffer from the three most common skin cancers. But for years, researchers believed the lowered risk was an incidental benefit, not one derived through the pressure of natural selection.

Even Charles Darwin poo-poohed the notion that pigmentation could be an adaptive trait. A new study, however, finds evidence that skin cancer was in fact a driving evolutionary force for early hominids to have darker skin.

http://blogs.discovermagazine.com/d-brief/2014/02/26/darker-skin-evolved-to-reduce-cancer-risk/#.Uw5SmeN_vfI

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Post by eddie on Wed Feb 26, 2014 9:03 pm

Well if one were to believe in evolution I'd say that we were all born dark-skinned (say of African origin) and that pieces of land broke off and drifted to cooler climates.
Hence the reason white people go darker in the sun and dark people don't go paler in the winter.

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Post by Raggamuffin on Thu Feb 27, 2014 9:59 am

There's another theory that dark-skinned people evolved when they moved to cooler areas and became paler so that they could synthesise Vitamin D from UV rays.

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Post by Guest on Thu Feb 27, 2014 10:06 am

Charles Darwin was a fool who knew nothing.

We all know that god sent us here on the backs of angels.

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Post by Guest on Thu Feb 27, 2014 10:15 am

BigAndy9 wrote:Charles Darwin was a fool who knew nothing.

We all know that god sent us here on the backs of angels.

darwin did say that if the fossil record does not support his hypothesis then he is wrong and it didn't so by his own standards he is wrong..

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Post by Guest on Thu Feb 27, 2014 12:59 pm

heavenly father wrote:
BigAndy9 wrote:Charles Darwin was a fool who knew nothing.

We all know that god sent us here on the backs of angels.

darwin did say that if the fossil record does not support his hypothesis then he is wrong and it didn't so by his own standards he is wrong..


Oh my, so you back everything on Darwin being right in regards to evolution , one moment

 ://?roflmao?/: 

This article has yet again shown more evidence for evolution, but then you missed that part I guess

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Post by Raggamuffin on Thu Feb 27, 2014 7:27 pm

Beekeeper wrote:
Raggamuffin wrote:
There's another theory that dark-skinned people evolved when they moved to cooler areas and became paler so that they could synthesise Vitamin D from UV rays.  

 scratch 

SUCH a hypothesis (NOT a theory, 'muffintop ~ there is a big difference ..) suggests to me that it was worded by a non-scientist who didn't actually have even a basic understanding of the principles of physiology, adaptation through natural selection, and survival of the fittest, that would be involved in such long-term population changes..

What's the problem with it? Melanin would help to block UV rays, which is fine in hot countries, but in cooler countries where there are less UV rays, the skin would need to have less melanin.
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Post by Eilzel on Thu Feb 27, 2014 7:34 pm

eddie wrote:Well if one were to believe in evolution I'd say that we were all born dark-skinned (say of African origin) and that pieces of land broke off and drifted to cooler climates.
Hence the reason white people go darker in the sun and dark people don't go paler in the winter.

Humans evolved long after the land formations as we know them today had formed eds (though there may have been some 'land bridges' such as the northern eastern most point of modern Russia and Alaska); but yes we were originally all dark skinned and originated in Africa- I have no idea why or how we evolved to have lighter skin but ragga's hypothesis seems likely.

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Post by eddie on Thu Feb 27, 2014 8:53 pm

Eilzel wrote:
eddie wrote:Well if one were to believe in evolution I'd say that we were all born dark-skinned (say of African origin) and that pieces of land broke off and drifted to cooler climates.
Hence the reason white people go darker in the sun and dark people don't go paler in the winter.

Humans evolved long after the land formations as we know them today had formed eds (though there may have been some 'land bridges' such as the northern eastern most point of modern Russia and Alaska); but yes we were originally all dark skinned and originated in Africa- I have no idea why or how we evolved to have lighter skin but ragga's hypothesis seems likely.

Well I won't argue my point les as my knowledge of these things is tepid to say the least lol

I think beekeeper' spots about the reddish-brown skin - I've heard that before? But do you then have to believe in Adam and Eve and ergo, God?

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Post by Eilzel on Thu Feb 27, 2014 9:02 pm

eddie wrote:
Eilzel wrote:

Humans evolved long after the land formations as we know them today had formed eds (though there may have been some 'land bridges' such as the northern eastern most point of modern Russia and Alaska); but yes we were originally all dark skinned and originated in Africa- I have no idea why or how we evolved to have lighter skin but ragga's hypothesis seems likely.

Well I won't argue my point les as my knowledge of these things is tepid to say the least lol

I think beekeeper' spots about the reddish-brown skin - I've heard that before? But do you then have to believe in Adam and Eve and ergo, God?

I wouldn't take anything written in the Bible as Gospel  Wink 

You could believe we had reddish-brown skin, but you don't have to accept Adam and Eve. I think (correct me if I'm wrong Bee) that Bee's point was that even in the Bible the first people were described as having that colour skin and so even from a Biblical pov there is still a need to explain diverse skin colour; which our resident creationists cannot do  Smile 

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Post by veya_victaous on Thu Feb 27, 2014 11:17 pm

Raggamuffin wrote:
Beekeeper wrote:
scratch

SUCH a hypothesis (NOT a theory, 'muffintop ~ there is a big difference ..) suggests to me that it was worded by a non-scientist who didn't actually have even a basic understanding of the principles of physiology, adaptation through natural selection, and survival of the fittest, that would be involved in such long-term population changes..

What's the problem with it? Melanin would help to block UV rays, which is fine in hot countries, but in cooler countries where there are less UV rays, the skin would need to have less melanin.

Ragga is right that is a hypothesis, but the more detailed version is that albino people are born at random in any area, but only in the cooler climates could they survive as effectively as dark skinned people. Once you get to really cold climates the albino actually survives better (due to the high Vitamin D absorption). Thus the more pigment-less breeders over time resulting in a lighter average skin colour.

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