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Tagged With "evolutionary"

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Study of African-American Chromosome Poke Holes In Evolutionary Theory

sunnubian ·
Study of African-American Chromosome Poke Holes In Evolutionary Theory March 7, 2013 | Filed under: Featured , Headlines | Posted by: Editorial_Staff Africans are the world’s oldest human species and the only 100% modern humans AFRICANGLOBE – Scientists say an African-American male’s odd genetic signature suggests that the human Y chromosome’s lineage goes back further in time than they thought — perhaps due to interbreeding with other populations such as Neanderthals. “This really upsets a...
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In Nature, when it comes to humans, does color matter?

Yemaya ·
I wanted to address this issue because it seems as if American society is being drowned with this message that color doesn't matter. I don't really care to discuss to social implications of this in terms of how people are treated. I want this...
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Re: Study of African-American Chromosome Poke Holes In Evolutionary Theory

Yemaya ·
Yes of course African-Americans have some neanderthal dna on the Y chromosome... white men consistently raped and procreated with the African women brought over to be enslaved. There is 0% Neanderthal genetic material in any African ethnic group. See links below. http://news.discovery.com/huma...ern-human-121101.htm http://news.discovery.com/huma...anderthal-110718.htm
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Re: Study of African-American Chromosome Poke Holes In Evolutionary Theory

Kocolicious ·
Hammer said there could be two explanations for the previously unidentified Y-chromosome type: Either the genetic heritage of anatomically correct humans really does go back much further than what’s reflected in the fossil record — or other populations, such as Neanderthals or the more recently identified Denisovans, interbred with modern humans. Anthropologists refer to that pattern of divergence followed by renewed interbreeding as introgression. See? This is what I have been saying...
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Re: In Nature, when it comes to humans, does color matter?

EbonyRose ·
Hmmmmm .... ???? Well, I have absolutely no idea! Biology should have been my strong suit ...but due to a rather colorful education experience through my formative years ... well, let's just say it isn't! But, that's a hell of a good question though, Yemaya! I look forward to hearing a discussion about it ... I'm sure I could learn a few things!
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Re: In Nature, when it comes to humans, does color matter?

Yemaya ·
Ok well let's start of with a definition of what melanin is. I will give a few definitions. From WikiPedia : Melanin ( Greek μέλας, black ; pronounced /ˈmɛlənɪn/ <small> ( listen )</small> is a class of compounds found in plants , animals , and protists , where it serves predominantly as a pigment . The class of pigments are derivatives of the amino acid tyrosine . Many melanins are insoluble salts and show affinity to water. [ citation needed ] The most common form of biological...
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Re: In Nature, when it comes to humans, does color matter?

sunnubian ·
. Evidently color does matter in nature, considering that it is nature that is responsible for any and all color on earth, including that of human beings. Color or lack of color in humans is only an adaptation to environment, no different or for no other reason than it is for flowers, trees, animals, fish, birds, or fruit and vegetables. That fact alone is what makes it ridiculous for people to actually believe that the color of another human being means anything negative or positive.
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Re: In Nature, when it comes to humans, does color matter?

Yemaya ·
Reference: I don't really care to discuss to social implications of this in terms of how people are treated. I want this discussion to lean more heavily on the scientific data that is available about hue-mans, what causes color and what is the natural evolutionary purpose of having color (melanin). And the ultimate question, does our color make us superior or inferior in terms of science. Sunnubian, sista, this is a discussion based on science. I'm curious what and if there are any...
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Re: In Nature, when it comes to humans, does color matter?

Yemaya ·
Now I'm asking the question: Are we really ready to have this mature discussion on science??? Where is Shulamite?? I'm sure that with her scientific background she would be able to add some insight into this.
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Re: In Nature, when it comes to humans, does color matter?

sunnubian ·
Scientifically, it is quite simple, melanin is produced by the body to protect it from the rays of the sun.
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Re: In Nature, when it comes to humans, does color matter?

Yemaya ·
hmmm so the only advantage to having melanin is that we are protected from the harmful UV rays of the sun?? That definitely sounds like a natural advantage. That's not a small feat. Yet we are constantly bombarded with the message that skin color doesn't matter? A perfect example of how it does indeed matter. Now I wonder what happens to that energy after it becomes absorbed by the dermal melanin??
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Re: In Nature, when it comes to humans, does color matter?

Yemaya ·
And what of melanin that is found inside the body in organs?
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Re: In Nature, when it comes to humans, does color matter?

James Wesley Chester ·
Reference: '...does our color make us superior or inferior in terms of science.'---Yemaya Color is a defense mechanism against the damaging effects of sunlight. Life is more comfortable with it than without it. Period. No one...no one ever attempts to contradict that. Everything else is societal. Including those who talk about 'color doesn't matter'. PEACE Jim Chester
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Re: In Nature, when it comes to humans, does color matter?

shulamite ·
Hey, Yemaya The melanin pathways have multiple functions, though the function scientists recognize best is the protection from free radical damage and (UV mediated) DNA nicking. There are "balanced polymorphisms" (eg certain "versions") of melanins that confer different types of benefits that have nothing to do with sun protection. When I discussed this here last year, I think I mentioned some of the other beneficial effects... shulamite
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Re: In Nature, when it comes to humans, does color matter?

Yemaya ·
Thank Shulamite. I'll have to find the link to that discussion. I'll pick it up there. Yemaya
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Re: In Nature, when it comes to humans, does color matter?

Huey ·
Don't we also get Vitamin D from the sun as well (through our skin)? That's another reason. Because of that, not too many black folks ever suffer from brittle bones.
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