Evolution of skin colors of the world

Evolution of skin colors of the world

There are 62 comments on the www.scientificblogging.com story from Jan 9, 2008, titled Evolution of skin colors of the world. In it, www.scientificblogging.com reports that:

Skin color results from the presence of the pigment melanin, an organic molecule that absorbs UV radiation and neutralizes free-radicals produced by UV radiation.

The more melanin, the more protection against UV radiation and the darker the skin. Hmm, if that is the case, why do not all humans have dark skin?

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“Got Science?”

Since: Apr 07

Location hidden

#1 Jan 9, 2008
I know there's a segment of society that disagrees with evolution on some aspects but how can anyone disagree with humans in various areas naturally changing to balancing vitamins and protection?
Adrian in Tacoma

Bonney Lake, WA

#2 Jan 9, 2008
The warmer climates folks didn't need to wear as many fur coats, pending where a particular culture originally disseminated...
Vox

Fort Morgan, CO

#3 Jan 9, 2008
Then there are the moths in England whose color changed from white to dark over generations so they could be camouflaged when they rested on dark tree bark.
Sorry I don't remember the particular case, but it came up in a biology class I had about forty years ago. Same species, change in color over a short period of time.
Maybe someone could help with this source, I tried but couldn't find it, and that textbook is long gone.
56th and damen

Stockton, CA

#4 Jan 9, 2008
pygmies eat less and you can fit more of them in a given area than you can the rest of humanity. why don't we all have the same finger prints. God made us all unique. if all canyons were (grand) and all art were the painting (the scream) that would be the end of site seeing and art, no? it's the differences that help us ask the questions that spur on science.
Ajepa

Orlando, FL

#5 Jan 9, 2008
Wonder why the American Eskimos have dark skin while the Scandinavians have light skin?
56th and damen

Stockton, CA

#6 Jan 9, 2008
Cash wrote:
I know there's a segment of society that disagrees with evolution on some aspects but how can anyone disagree with humans in various areas naturally changing to balancing vitamins and protection?
i assume that the disagreeable one's you are referring to are the Christians, they believe that God man and the earth. why wouldn't He give man the skin color best suited to the area he would inhabit.
56th and damen

Stockton, CA

#7 Jan 9, 2008
i assume that the disagreeable one's you are referring to are the Christians, they believe that God created man and the earth. why wouldn't He give man the skin color best suited to the area he would inhabit.

“Don't try to goad me...”

Since: Nov 07

... I'm a goadless heathen.

#8 Jan 9, 2008
Ajepa wrote:
Wonder why the American Eskimos have dark skin while the Scandinavians have light skin?
Read the article.
sherlew

Ashburn, VA

#9 Jan 9, 2008
Hi Vox, I ran an online search and found this:

http://www.arn.org/docs/wells/jw_pepmoth.htm

Here's the search results page:

http://www.ask.com/web...
Jeromin

Cincinnati, OH

#10 Jan 9, 2008
Why is it so hard to understand that we, humans, are not the center of the Universe? We, as many other creatures, will evolve to adapt to the circumstances, so we can continue living and existing. That is a fundamental law to which all creatures are subjected to. The moment we fail to adapt -whatever it takes- is the instant of our good bye to our existence.
By the way, we are definitly NOT made in the image of God. To think that God must have an "image" is infinitly idiotic.

“Got Science?”

Since: Apr 07

Location hidden

#11 Jan 9, 2008
56th and damen wrote:
i assume that the disagreeable one's you are referring to are the Christians, they believe that God created man and the earth. why wouldn't He give man the skin color best suited to the area he would inhabit.
Well, probably under 1% of Christians. We don't live in a country like most in the mid-east where science is hampered by having to be filtered through religious training.

But, yes, I was referring to the 1% who want to invalidate evolution entirely because there are not explanations for everything yet.
Vox

Fort Morgan, CO

#12 Jan 9, 2008
sherlew wrote:
Hi Vox, I ran an online search and found this:
http://www.arn.org/docs/wells/jw_pepmoth.htm
Here's the search results page:
http://www.ask.com/web...
Great article! Shows we must be careful in our testing,and evaluating those tests.
I felt as if I was in school again.
I commend this site to anyone interested in the processes of natural selection, and also, in seeing how complex a careful study can be.
Many thanks......
THUMPER thumper

Morvin, AL

#13 Jan 9, 2008
I am beginning to regard these TOPIX forums as little more than the sensational non-issues of the Enquirer. Anyone who has taken a course in physical anthropology would be well advanced beyond the scope of this article. Not all skin color is due to the presence of melanin. The total amount of melanin in the skin cell is only secondary to skin color, as the orientation of the melanin platelets in the skin cell is just as significant. What about the relative amounts of keratin in the skin cells? What about the effects of solar oxidation on hemoglobin in the upper capillaries of the dermis and epidermis? These variables were identified a LONG time ago as being significant in affecting skin color. The synchronistic attitudes reflected in these TOPIX forums do nothing to either advance knowledge or to educate. They only stir up petty and sensationalistic non-issues to incite a response. Unfortunately, these responses are the result of the gut-instinct foolishness that was spread by a system of education that is nothing more than the perpetuation of dogma and ignorance necessary to promote a skewed status quo.
Incredulous

Crescent City, CA

#14 Jan 9, 2008
This happened during the Industrial Age in response to the black soot that ended up coating most of England.
Vox wrote:
Then there are the moths in England whose color changed from white to dark over generations so they could be camouflaged when they rested on dark tree bark.
Sorry I don't remember the particular case, but it came up in a biology class I had about forty years ago. Same species, change in color over a short period of time.
Maybe someone could help with this source, I tried but couldn't find it, and that textbook is long gone.
THUMPER thumper

Morvin, AL

#15 Jan 9, 2008
Cash wrote:
<quoted text>
Well, probably under 1% of Christians. We don't live in a country like most in the mid-east where science is hampered by having to be filtered through religious training.
But, yes, I was referring to the 1% who want to invalidate evolution entirely because there are not explanations for everything yet.
Not hampered by by having to be filtered through religious training? What planet have you been hiding out on? Look at your money!! What does it say? Were you forced to recite the pledge of allegiance in school? What did it say? This figure that you arbitrarily place at 1% is far greater than you can rationally imagine. It is more obvious that those who refuse to accept evolution are those masses that have not adequately evolved.
Incredulous

Crescent City, CA

#16 Jan 9, 2008
Cash wrote:
<quoted text>
Well, probably under 1% of Christians. We don't live in a country like most in the mid-east where science is hampered by having to be filtered through religious training.
But, yes, I was referring to the 1% who want to invalidate evolution entirely because there are not explanations for everything yet.
While I usually agree with most of your insights Cash, I have to take minor exception with this one. While science research isn't filtered through religious training per se, I think that science funding (ie. stem cells), science teaching (EVO vs ID; abstinence only ed), and the dissemination of government data (global warming, pollution, health) is increasingly filtered by people with a religious/moral agenda. How many times during the last 7 years have we read about a government scientist who was silenced or about a scientific report being redacted by a politico with no scientific background (there was another exampled reported in the last week or so)? While not all of this filtering is because of religion, some of it definitely is.
Vox

Stockton, CA

#17 Jan 9, 2008
THUMPER thumper wrote:
I am beginning to regard these TOPIX forums as little more than the sensational non-issues of the Enquirer. Anyone who has taken a course in physical anthropology would be well advanced beyond the scope of this article. Not all skin color is due to the presence of melanin. The total amount of melanin in the skin cell is only secondary to skin color, as the orientation of the melanin platelets in the skin cell is just as significant. What about the relative amounts of keratin in the skin cells? What about the effects of solar oxidation on hemoglobin in the upper capillaries of the dermis and epidermis? These variables were identified a LONG time ago as being significant in affecting skin color. The synchronistic attitudes reflected in these TOPIX forums do nothing to either advance knowledge or to educate. They only stir up petty and sensationalistic non-issues to incite a response. Unfortunately, these responses are the result of the gut-instinct foolishness that was spread by a system of education that is nothing more than the perpetuation of dogma and ignorance necessary to promote a skewed status quo.
My college studies took place many years ago. Things have changed since then. A famous study of the Peppered Moth has been revisited with a better understanding of issues involved.
http://www.arn.org/docs/wells/jw_pepmoth.htm
This site, recommended to me by a previous post, is most enlightening. I thoroughly enjoyed it, and believe I learned from it. I'm indebted to the chap that showed it to me in the reply to my post.
Aren't these "thread" meant for the use of all? Or are they just for the anointed few? Seems to me, learned as you obviously are, you could be a bit more tolerant.
Paul

Dallas, TX

#18 Jan 9, 2008
THUMPER thumper wrote:
I am beginning to regard these TOPIX forums as little more than the sensational non-issues of the Enquirer. Anyone who has taken a course in physical anthropology would be well advanced beyond the scope of this article. Not all skin color is due to the presence of melanin. The total amount of melanin in the skin cell is only secondary to skin color, as the orientation of the melanin platelets in the skin cell is just as significant. What about the relative amounts of keratin in the skin cells? What about the effects of solar oxidation on hemoglobin in the upper capillaries of the dermis and epidermis? These variables were identified a LONG time ago as being significant in affecting skin color. The synchronistic attitudes reflected in these TOPIX forums do nothing to either advance knowledge or to educate. They only stir up petty and sensationalistic non-issues to incite a response. Unfortunately, these responses are the result of the gut-instinct foolishness that was spread by a system of education that is nothing more than the perpetuation of dogma and ignorance necessary to promote a skewed status quo.
THANK YOU!!....there is intelligence out there
pile of dog sh1t

Stockton, CA

#20 Jan 9, 2008
Vox wrote:
<quoted text>
My college studies took place many years ago. Things have changed since then. A famous study of the Peppered Moth has been revisited with a better understanding of issues involved.
http://www.arn.org/docs/wells/jw_pepmoth.htm
This site, recommended to me by a previous post, is most enlightening. I thoroughly enjoyed it, and believe I learned from it. I'm indebted to the chap that showed it to me in the reply to my post.
Aren't these "thread" meant for the use of all? Or are they just for the anointed few? Seems to me, learned as you obviously are, you could be a bit more tolerant.
The hot air from the bullsh1tin know-it-alls makes the world twirl, true story.
BOBBYB

United States

#21 Jan 9, 2008
It's very simply all you have to do is standerdize melanin and give every body a shot Presto no more discentergration. vola civilation is saved. Ether that or paint every body one color. We all can't be on lollypop lane. And the only time i HATE moths is when they fly into my soup.Remenber a jackass of another color is syill a jackass

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