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Why Are Blacks Black?  
User currently offlineNWADC9 From United States of America, joined May 2004, 4898 posts, RR: 9
Posted (9 years 6 months 3 weeks 3 days 23 hours ago) and read 3021 times:

All in the title. Now, this is not to be a racist thread, so here me out on this. Why are African's, Hispanics, Indians, and others brown-black instead of peach-white? Is it just a coincidence?


Flying an aeroplane with only a single propeller to keep you in the air. Can you imagine that? -Capt. Picard
37 replies: All unread, showing first 25:
 
User currently offlineNewark777 From United States of America, joined Dec 2004, 9348 posts, RR: 29
Reply 1, posted (9 years 6 months 3 weeks 3 days 23 hours ago) and read 3017 times:

Closer to the equator = darker skin. It's called evolution.

Harry



Why grab a Heine when you can grab a Busch?
User currently offlineLOT767-300ER From , joined Dec 1969, posts, RR:
Reply 2, posted (9 years 6 months 3 weeks 3 days 22 hours ago) and read 2975 times:

Quoting Newark777 (Reply 1):
Closer to the equator = darker skin. It's called evolution.

Its also called melanin.


User currently offlineDfwRevolution From United States of America, joined Jan 2010, 1001 posts, RR: 51
Reply 3, posted (9 years 6 months 3 weeks 3 days 22 hours ago) and read 2970 times:

Your genetic phenotype determins how much melanin your skin produces. Melanin is a chemical produced by the body in everyone but albinos, and it contributes to the UV sheilding properties of your skin. This is why someone with dark skin sunburns slower than someone from Ireland who will be peeling in a few hours.  Wink

Until the neolithic age, when we started to get our heads out of our asses, the amount of melanin your body produced could mean the difference between life or death if you lived near the equator. You had to have it or you would be sunburned into oblivion. If you lived in Scandanavia at the time, melanin wasn't that important as you recieved little direct sunlight.

Skin pigment isn't as necessary for survival today, though it is convienient and attractive (to some people), however your genetic phenotype just can't forget how to produce whatever quantity of melanin you produce.

Genetics are a weird stuff, everyone in my family sunburns really easily but I tan rather well.


User currently offlineACDC8 From Canada, joined Mar 2005, 7653 posts, RR: 35
Reply 4, posted (9 years 6 months 3 weeks 3 days 22 hours ago) and read 2967 times:

Quoting Newark777 (Reply 1):
Closer to the equator = darker skin

What about Eskimos?  Wink



A Grumpy German Is A Sauerkraut
User currently offlineDfwRevolution From United States of America, joined Jan 2010, 1001 posts, RR: 51
Reply 5, posted (9 years 6 months 3 weeks 3 days 22 hours ago) and read 2957 times:

Quoting ACDC8 (Reply 4):
What about Eskimos?

I'm going out on a limb here... but I'd venture a guess that when the people from Mongolia uped and decided to follow the big frickin whatever-they-ate across the landbridge into North America, a few stopped along the way and set-up shop in Alaska and Canada.

Human DNA takes for-frickin-ever to change traits, so they just kept their central Asian skin pigment despite not needing it as much.


User currently offlineDL021 From United States of America, joined May 2004, 11447 posts, RR: 75
Reply 6, posted (9 years 6 months 3 weeks 3 days 22 hours ago) and read 2942 times:

Quoting ACDC8 (Reply 4):
What about Eskimos?



Quoting DfwRevolution (Reply 5):
I'm going out on a limb here... but I'd venture a guess that when the people from Mongolia uped and decided to follow the big frickin whatever-they-ate across the landbridge into North America, a few stopped along the way and set-up shop in Alaska and Canada.

Perhaps because their skin required less adaptation due to the fact that it was generally well covered, whereas the peoples inhabiting the equatorial and warmer climes wore, and still wear in pre-industrial cultures that remain to this day, less clothes because their culture never developed the need to warm up the body temperature. That and the fact that they migrated much later in their evolutionary cycle. Skin pigmentation trends developed differently at a much earlier period of human development than the theorized migration across the Bering Straights....which has recently, through genetic testing, been postulated to be a very small number of individuals who crossed and began populating the continent.....which leads to some very interesting questions for another thread.

[Edited 2005-06-01 05:21:23]


Is my Pan Am ticket to the moon still good?
User currently offlineSLC1 From , joined Dec 1969, posts, RR:
Reply 7, posted (9 years 6 months 3 weeks 3 days 22 hours ago) and read 2924 times:

This has a lot to do with Vitamin D as well as sunburn, sunlight stimulates Vitamin D production, so in order to regulate how much Vit. D is produced, your skin adjusts melanin level. People with darker skin, who live in areas where more skin is exposed have less reaction to Vit. D than the more heavily-clothed peoples further from the equator who would at the equator be at a selective disadvantage by overproduction of Vit. D. This helps to explain why Black People didn't evolve in Scandinavia.

User currently offlinePROSA From United States of America, joined Oct 2001, 5644 posts, RR: 4
Reply 8, posted (9 years 6 months 3 weeks 3 days 21 hours ago) and read 2903 times:

The Sun exposure = dark skin rule sometimes needs to be qualified a bit. African groups that lived deep in the equatorial rain forest were just as dark as any other Africans even though they were exposed to relatively little sunlight. The now-extinct Tasmanians had black skin even though they lived in a temperate, often cloudy climate. In both cases, the groups probably migrated from more Sun-exposed areas.


"Let me think about it" = the coward's way of saying "no"
User currently offlineN1120A From United States of America, joined Dec 2003, 26812 posts, RR: 75
Reply 9, posted (9 years 6 months 3 weeks 3 days 17 hours ago) and read 2813 times:

Quoting DfwRevolution (Reply 3):
Your genetic phenotype determins how much melanin your skin produces.

Wow Rev, I am impressed by the use of those words in Texas outside of Austin. Just kidding



Mangeons les French fries, mais surtout pratiquons avec fierte le French kiss
User currently offlineSeptember11 From United States of America, joined May 2004, 3623 posts, RR: 21
Reply 10, posted (9 years 6 months 3 weeks 3 days 12 hours ago) and read 2761 times:

Very cool ...

I always wanted to know why do black people have bigger nose than others? (why did Micheal Jackson have nose surgery)

[Edited 2005-06-01 15:26:18]


Airliners.net of the Future
User currently offlineAlberchico From United States of America, joined Sep 2004, 2958 posts, RR: 0
Reply 11, posted (9 years 6 months 3 weeks 3 days 11 hours ago) and read 2724 times:

''Quoting Newark777 (Reply 1):
Closer to the equator = darker skin. It's called evolution.''


It's the result of years of living under the sun. Notice that blacks all come from hot dry countries ?



short summary of every jewish holiday: they tried to kill us ,we won , lets eat !
User currently offlineGarnetpalmetto From United States of America, joined Oct 2003, 5426 posts, RR: 52
Reply 12, posted (9 years 6 months 3 weeks 3 days 11 hours ago) and read 2711 times:

Quoting Alberchico (Reply 11):
Notice that blacks all come from hot dry countries ?

Funny, I had no clue that the Great Lakes region of Africa was "dry"



South Carolina - too small to be its own country, too big to be a mental asylum.
User currently offlineVC10BOAC From United States of America, joined Feb 2004, 407 posts, RR: 0
Reply 13, posted (9 years 6 months 3 weeks 3 days 10 hours ago) and read 2691 times:

Quoting September11 (Reply 10):
I always wanted to know why do black people have bigger nose than others? (why did Micheal Jackson have nose surgery

Well, I am "black" and I have seen many Caucasians with honkers much larger than mine. Different ethnic groups just tend to have different features, (shape of nose, eyes, ect) which could probably be attributed to several factors, genetics likely playing the greatest role.

As for the Michael Jackson question, the answer is that he is weird, misguided and is no rocket scientist.. I believe that he was trying to change the shape of his nose (among other things) and transformed himself from a "black" man to a "God knows what color, God knows what sex" freak.


User currently offlineSLC1 From , joined Dec 1969, posts, RR:
Reply 14, posted (9 years 6 months 3 weeks 3 days 10 hours ago) and read 2685 times:

Large noses and longer limbs in comparison to the body are a selective advantage in warmer climates, as opposed to small noses and stubby limbs found in populations that evolved in colder climates.

User currently offlineSAS_A330-300 From , joined Dec 1969, posts, RR:
Reply 15, posted (9 years 6 months 3 weeks 3 days 10 hours ago) and read 2675 times:

Quoting SLC1 (Reply 7):
This has a lot to do with Vitamin D as well as sunburn, sunlight stimulates Vitamin D production, so in order to regulate how much Vit. D is produced, your skin adjusts melanin level. People with darker skin, who live in areas where more skin is exposed have less reaction to Vit. D than the more heavily-clothed peoples further from the equator who would at the equator be at a selective disadvantage by overproduction of Vit. D. This helps to explain why Black People didn't evolve in Scandinavia.

Strange. Also at the time it's funny that mention Scandinavia as an example because it's one of few places in the world where you drink milk more or less every day until you die. Milk also contains Vitamin D. A known joke over here why the indians never the vikings settle down in America 1000 years ago was because the vikings offered them milk but the indians were lactose-intolerant and thought it was some kind of poison and chased them away.  Wink

Quoting PROSA (Reply 8):
The Sun exposure = dark skin rule sometimes needs to be qualified a bit. African groups that lived deep in the equatorial rain forest were just as dark as any other Africans even though they were exposed to relatively little sunlight. The now-extinct Tasmanians had black skin even though they lived in a temperate, often cloudy climate. In both cases, the groups probably migrated from more Sun-exposed areas

It's also called UV-light (Ultra-violet). Snow reflects 80% of all rays, sand 25% and water 10%. Even on cloudy day you'll be exposed to about 50%.
The high percentage of reflection of snow might explain why Eskimos has a bit dark skin. Also, the ozone-hole has recently increased over both poles.


User currently offlineJaysit From , joined Dec 1969, posts, RR:
Reply 16, posted (9 years 6 months 3 weeks 3 days 10 hours ago) and read 2671 times:

What about Eskimos?

Those you called Eskimos originally evolved from Asian-Pacific racial groups. Thus, the darker skin. Also, six months of sunlight in thinner atmosphere with less UV protection enhances the production of melanin.


User currently offlineSRQCrosscheck From United States of America, joined Mar 2005, 211 posts, RR: 1
Reply 17, posted (9 years 6 months 3 weeks 3 days 7 hours ago) and read 2629 times:

you should be asking why everyone isn't black like sub-saharan africans. homo sapiens evolved in east africa, spread throughout africa, and then were replaced in another wave of emigration of homo sapiens that also spread out of Africa perhaps as early as 50-30 k years ago.

All of the below is also at this website

Darker tones of skin are an adaptation to the intense UV sunlight of the equitorial regions of the earth. the epigenetic genes (there are only 6 known genes that influence skin color!) were selected in these populations for darker skin. Each shade of skin is a balance to provide adequate protection from UV rays. As you deviate from the equator, skin tone changes to achieve the right balance of vitamin D production and UV protection (lighter tones provide less protection, but since there is less intense UV light far from the equator, you need to be exposed to more UV to produce the same amount of Vit. D). Additionally, very dark skin tones seek to prevent too much intense UV absorbtion because too much UV light also interferes with the production of folic acid.

Apparently, the "default" skin tone is about that of native Ethiopians and Khosians. (hmm... i'm not sure how this source determined that... how could their be a "default" if all skin tones are adaptive "defaults" for a certain region?)

There are other complications though. Native south americans weren't as dark as they "should" have been given their proximity to the equator. It's been speculated that this is because native americans were originally from northeast asia, which "lightened" their skin tone. since skin tone is an epigenetic trait (many genes are involved), perhaps the right combo could not be reattained due to previous selection for lighter skin (while in northeast asia).

Also, if your diet includes a lot of vitamin D from sources like meat and fish (rather than grain), your skin tone will be a little darker. You can "afford" the extra protection against UV absorbtion, since you don't need the vitamin D produced by the UV absorbtion through the skin. Thus, the Inuits, other Native North Americans, and Mongols have darker skin.

Milk is fortified with vitamin D (it doesn't contain it naturally like fish/meat does) to supplement the diets of people who live at very high latitudes. There is documented evidence that people of african decent who live at high latitudes are vit D deficient, particularly during the winter months. (this is really interesting from a public health perspective)

[Edited 2005-06-01 19:55:37]

User currently offlineBrettbrett21 From United Kingdom, joined Jun 2004, 436 posts, RR: 0
Reply 18, posted (9 years 6 months 3 weeks 3 days 2 hours ago) and read 2541 times:

Wouldn't it make more ''sense'' for people in hotter climates to have lighter skin so that the dark skin doesn't absorb the heat. For this you have to ignore sunburn completely...but maybe something evolution can work on in the future!!


i'm so excited i wish i could wet my pants!
User currently offlineNworlnsbearcub From United States of America, joined Feb 2004, 166 posts, RR: 0
Reply 19, posted (9 years 6 months 3 weeks 2 days 23 hours ago) and read 2496 times:

Quoting Brettbrett21 (Reply 18):
Wouldn't it make more ''sense'' for people in hotter climates to have lighter skin so that the dark skin doesn't absorb the heat

Nope. Maybe for the sake of 'heat' , but dark skin tends to be less prone to sun damage...



Long after the thrill of low price, lingers the bad taste of low quality..
User currently offlineAR1300 From Argentina, joined Feb 2005, 1740 posts, RR: 3
Reply 20, posted (9 years 6 months 3 weeks 2 days 22 hours ago) and read 2475 times:

God created them that way?  Wink

Mike



They don't call us Continental for nothing.
User currently offlineErikwilliam From Brazil, joined Mar 2004, 2152 posts, RR: 11
Reply 21, posted (9 years 6 months 3 weeks 1 day 12 hours ago) and read 2380 times:

the true question shouldn´t be, why blacks are black, but, why do we have 5 fingers?why do we have 32teeths?

on a serious response, because they came from a hot hot place, and the sun really hurts the skin, that means, that a darker skin is more protected from the sun.
On the other hand, white people that live in the northern places, don´t have that much contact with the sun, that means that the body doesn´t produces melalanin, so the skin gets wither. and so it goes.....



Dida, Cafu, Lucio, Roque Junior, Roberto Carlo, Emerson, Ze Roberto, Ronaldinho, Kaka, Adriano, Robinho, Ronaldo
User currently offlineRedngold From United States of America, joined Mar 2000, 6907 posts, RR: 44
Reply 22, posted (9 years 6 months 3 weeks 1 day 12 hours ago) and read 2368 times:

Quoting LOT767-300ER (Reply 2):
Its also called melanin.



Quoting DfwRevolution (Reply 3):
Skin pigment isn't as necessary for survival today, though it is convienient and attractive (to some people), however your genetic phenotype just can't forget how to produce whatever quantity of melanin you produce.



Quoting Erikwilliam (Reply 21):
On the other hand, white people that live in the northern places, don´t have that much contact with the sun, that means that the body doesn´t produces melalanin, so the skin gets wither. and so it goes.....

Ahhh, the farce of trying to explain melanin.

Gentlemen, I hate to contradict you, but all humans have the same amount of melanin in their skin! That's right, black or white or somewhere in between, the melanin content is exactly the same.

The difference is the CONFIGURATION of the melanin - two or three dimensional. If I remember correctly from Anatomy & Physiology class, lighter skinned people have melanin lying in flat sheets deeper in the skin, while darker skinned people have melanin closer to the surface and in "stacks."

Excitation of the melanin molecule can cause it to change configuration, which is why we can get tan from being out in the sun.



Up, up and away!
User currently offlineIakobos From Belgium, joined Aug 2003, 3316 posts, RR: 34
Reply 23, posted (9 years 6 months 3 weeks 1 day 12 hours ago) and read 2366 times:

It is all understandable for the differences in skin color, but why are their genitals so astonishingly big ?  frown 

Signed GKirk


User currently offlineTACAA320 From , joined Dec 1969, posts, RR:
Reply 24, posted (9 years 6 months 3 weeks 1 day 12 hours ago) and read 2361 times:

"Closer to the equator = darker skin. It's called evolution."

Evolution?????


25 September11 : very true ......... I have no clue as to why their genitals (generally speaking) so astonishgly big ... blonde go-go girls love them, lol ...
26 Jaysit : It is all understandable for the differences in skin color, but why are their genitals so astonishingly big ? Makes fighting lions and cheetahs easier
27 Erikwilliam : really sure about that reddy?
28 Captaink : I am black, but I am pretty averaged sized in the penal area... (whatever average is) LOL.. I do know people of other ethnicities who are pretty well
29 Post contains images Erikwilliam : Captaink: thank you very much for sharing this very illustrative piece of information related to the penal size. I personnaly love talking about it si
30 VC10BOAC : No Sir, it is no myth. You need to check and see where your genes came from!!
31 Post contains images Captaink : LOL maybe I do need to check the genes.. But I guarantee that not all black people are huge..
32 Post contains links Redngold : You asked for it: http://www.avrocos.com/skin/skincolor.html In fact, the number of melanin cells is the same is the same in all races, however melan
33 Post contains images Csavel : Basically supposedly, yes living close to the equator when you have no hair will mean your skin will have to be dark lest you get early skin cancer an
34 Iakobos : We would have to define "hugeness" of course, but I disagree. Among other "material" to prove my point, let's say I was raised in Africa (read: RDC -
35 Post contains images Erikwilliam : WOW. thx Reddy, that is a great article to read. Think what you showed is very clarifying. But, if whe consider the time of evolution, and since the
36 Avek00 : IINM, on average, the genitalia of males of African descent are approximately 0.5-0.75 inches larger than the equipment of males of European ancestry.
37 PROSA : I recall reading some years back that the larger size of black males is not a matter of size per se, but is related instead to the flow of blood into
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