Biology and the origin of life

[HiT-2-TiMeS]

http://news.yahoo.com/s/afp/20070807/ts_alt_afp/usscienceorigins;_ylt=ArpKhyaoFwqqwlqERq.S0dwPLBIF

Challenges the out of africa theory. I dont think park boyz is gonna like this one.

 

[2-0-Sixx]

http://news.yahoo.com/s/afp/20070807/ts_alt_afp/usscienceorigins;_ylt=ArpKhyaoFwqqwlqERq.S0dwPLBIF

Challenges the out of africa theory. I dont think park boyz is gonna like this one.

New Research Proves Single Origin Of Humans In Africa

 

[ParkBoyz]

This can be caused by mutated genes, the same reason why some people are albinos. Not all people living near the equator are going to be dark and not people living away from the equator are going to be light...there are always excpetion sin a DNA gene pool. Some Vientnames are darker than others, some Hawaiians are darker than others, and so on and so fourth.

This isn't true.. All people "adapted" to equatorial regions by theory should be deeply pigmented. Albinos would have died out in such a hostile environment and this is not something that would be selected for an entire population in an equatorial/sub-equatorial environment. The selection pressure merely relaxed.

This is what i found on Bantu, albiet from Wiki:

Bantu is a general term for over 400 different ethnic groups in Africa, from Cameroon to South Africa, united by a common language family (the Bantu languages) and in many cases common customs.

In other words, youll have to be a bit less general.

Bantu all share recent common ancestry and what you omitted from the wikipedia reference is that they all descend from southwestern Nigeria, an equatorial environment. Nilotes in equatorial east Africa, and are direct descendants of the Khoisan. This information is nothing new.

^Half Bantu, half Khoisan. The picture of that Khoisan from wikipedia that you posted is not typical, but it is not to negate the indigenous diversity, only that extremely dark skin isn't a monopoly of Africa, nor is it ubiquitous there.

Take heed:

^Note that Khoisan are most generally found in Africa's southwest corner, now see the corresponding skin pigmentation reported there from the samples taken. Much lighter..

 

[Fucky McFuckerson]

http://news.yahoo.com/s/afp/20070807/ts_alt_afp/usscienceorigins;_ylt=ArpKhyaoFwqqwlqERq.S0dwPLBIF

Challenges the out of africa theory. I dont think park boyz is gonna like this one.

I dont think anyone is debating whether humans orginated in Africa or not, the theory goes is that at one point, all the continents were one LARGE one, and Africa seems to be the epicenter of first human life.

 

[ParkBoyz]

And the Berber, come in many skin tones.

Which is why I specifically specified the Amazigh Berbers, who generally lean towards lighter complexions. Unlike say, the Tuareg. I also noted that they tend to be substantially mixed.

Thougth they are lighter in color, they still have pigmentation in the skin.

All human beings do.. It is relative..

They are also on the way up to Morocco and Greece, where you begin to see the skin tone start to fade to lighter colors.

My same point about the Khoisan in the south, in parts of the continent that fade away from the equatorial strong hold.

Just a reminder, this is the earths equator. Berbers are fairly far north of the equator.

You merely repeated what I've already pointed out.

 

[Fucky McFuckerson]

This isn't true.. All people "adapted" to equatorial regions by theory should be deeply pigmented. Albinos would have died out in such a hostile environment and this is not something that would be selected for an entire population in an equatorial/sub-equatorial environment. What selection pressure merely relaxed.

Albinos are not a common occurance, thats why you only see a handful. My point was, genes mutate and this is why you see kids lighter than parents and so on.

Bantu all share recent common ancestry and what you omitted from the wikipedia reference is that they all descend from southwestern Nigeria, an equatorial environment. Nilotes in equatorial east Africa, and are direct descendants of the Khoisan. This information is nothing new.

I guess im confused as to what the argument is here...Africans live on the hottest continent in the world, whether it be nothern or southern. Do you see any WHITE people in Africa that are native? This is my point.

Are you refuting that humans adapted thousands if notmore years ago to their climate? Also, if Africa is the FIRST origin of human life, wouldnt the adaptation have moved around sporadicaly?

 

[Fucky McFuckerson]

^Note that Khoisan are most generally found in Africa's southwest corner, now see the corresponding skin pigmentation reported there from the samples taken. Much lighter..

Could this be from migration? It seems the most of central and southern Africa are on or near the equator, and most of the darker skinned Africans, according to the chart, reside in these areas. As a matter of fact, that chart would definately support that darker skinned people live near the equator.

 

[ThaG]

I dont think anyone is debating whether humans orginated in Africa or not, the theory goes is that at one point, all the continents were one LARGE one, and Africa seems to be the epicenter of first human life.

the continents were a single large one about 200My before humans appeared:ermm:

 

[ThaG]

You also forget that the equatorial Natives of central America contradicts this theory as they lack frequencies in pigmentation seen in other equatorial peoples such as Africans and Australians. The theory however, fits well within the range of micro-level diversity nonetheless.

I can think of two possible explanations for this:

1. they migrated relatively recently from the north

2. Equatorial America used to be one large forest, which shields a lot of the sun light, so the selective pressure towards darker skin was lower

 

[ParkBoyz]

Albinos are not a common occurance, thats why you only see a handful. My point was, genes mutate and this is why you see kids lighter than parents and so on.

You unintentionally misrepresent the premise. Genes are passed down from parents to offspring, and in the middle of an entire population of dark skinned people, where light skin is rare, by artificial selection they'd merely drown themselves out. Albinos on the other hand cannot survive generally as well as highly pigmented peoples who populate equatorial, high UV environments in Africa. The rule is dark skin, and away from the equator, the rule is not so dark skin. Which was my point with the Khoisan.

I guess im confused as to what the argument is here...Africans live on the hottest continent in the world,

This is exactly where you're confused as heat doesn't play a factor as much as UV radiation does. Heat can come from a variety of factors like humidity, which has no bearing on skin shade, heat is a temperature and has nothing to do with the damaging of skin cells.

whether it be nothern or southern. Do you see any WHITE people in Africa that are native? This is my point.

White people are native to extreme exposure of the northern climates and it was beneficial in such an environment that basically cut off most UV radiation that is needed for vitamin D production, where white (or extremely depigmented) skin was a necessity, if not a requirement.. I also pointed out to you that Berbers are substantially mixed, I'd never argue that white people are indigenous to Africa, as far as their distinct phenotype.

Are you refuting that humans adapted thousands if notmore years ago to their climate?

No, it seems that this is what you're saying for the Khoisan..

Also, if Africa is the FIRST origin of human life, wouldnt the adaptation have moved around sporadicaly?

^I'm having a hard time understanding this question, but I most definitely reinforce indigenous African diversity. Maybe you'd like to repeat this question?

 

[Fucky McFuckerson]

the continents were a single large one about 200My before humans appeared:ermm:

Did humans inhabit this giant continent or did humans come along after it seperated?

 

[Fucky McFuckerson]

^I'm having a hard time understanding this question, but I most definitely reinforce indigenous African diversity. Maybe you'd like to repeat this question?

Nevermind, i was thinking in tribal sanctions where humans could have migrated around Africa at one point, as now they are stationary. It wouldnt mean anything to adaptation or the spreading of skin color between tribes.

 

[ParkBoyz]

I can think of two possible explanations for this:

1. they migrated relatively recently from the north

2. Equatorial America used to be one large forest, which shields a lot of the sun light, so the selective pressure towards darker skin was lower

I can accept this as plausible since there's nothing to say it isn't the case. I'm not arguing that this discredits the hypothesis, only pointing out a seeming contradiction. In this case I have no point of disagreement with you, good explanation/observation as well.

 

[Fucky McFuckerson]

I can think of two possible explanations for this:

1. they migrated relatively recently from the north

2. Equatorial America used to be one large forest, which shields a lot of the sun light, so the selective pressure towards darker skin was lower

Brazil is also made up of many cultures due to culturalization, which over the last 3oo years has left the skin color in all different tones, depending on the mixture. However, the indigenius Brazilians are still very dark. Thus there being racial and class tension in many parts of S. America between light and dark colored folks...or so I have read.

 

[ParkBoyz]

Nevermind, i was thinking in tribal sanctions where humans could have migrated around Africa at one point, as now they are stationary. It wouldnt mean anything to adaptation or the spreading of skin color between tribes.

Still not clear. Were you trying to suggest that there could be light populations in the south due to intermingling and migrations from the north, that can explain the variation in Africa? Or that inner Africans merely spread through out the continent, adapting to their own respected micro-environments? In the latter case, I'm obliged to agree.

 

[ParkBoyz]

http://news.yahoo.com/s/afp/20070807/ts_alt_afp/usscienceorigins;_ylt=ArpKhyaoFwqqwlqERq.S0dwPLBIF

Challenges the out of africa theory. I dont think park boyz is gonna like this one.

LOL.. It wouldn't make a difference to me. Though if it did, I'm not threatened since the Multi-regional hypothesis is moot as there is a serious lack of genetic evidence to support it and the archaeological evidence is scant..

 

[ThaG]

Did humans inhabit this giant continent or did humans come along after it seperated?

long after that

 

[Fucky McFuckerson]

Still not clear. Were you trying to suggest that there could be light populations in the south due to intermingling and migrations from the north, that can explain the variation in Africa? Or that inner Africans merely spread through out the continent, adapting to their own respected micro-environments? In the latter case, I'm obliged to agree.

The latter.

dude did you even read what he wrote? or are you just asking thag to do your homework. not that that's bad. thag would probably do it.

I did, but i take everyting measured in millions of years with a grain of salt. Who is to say that no humans or the like did inhabit it...or that it even was 200 million years prior.

 

[ThaG]

dude did you even read what he wrote? or are you just asking thag to do your homework. not that that's bad. thag would probably do it.

Yeah, I will:

http://en.wikipedia.org/wiki/Pangea

http://en.wikipedia.org/wiki/Image:Pangea_animation_03.gif

 

[ThaG]

I did, but i take everyting measured in millions of years with a grain of salt. Who is to say that no humans or the like did inhabit it...or that it even was 200 million years prior.

arrghhhhhh

All the evidence says this

there were hardly any mammals around 200 MYa, what about hominids???