Large African DNA Study

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www.sciencenews.org/view/generic/id/43377/title/Expansive_genetic_diversity_in_Africa_revealed



Tishkoff and her colleagues analyzed the genetic information of more than 3,000 people from 121 different populations of self-identified ethnic groups scattered throughout Africa.

The researchers found that the genetic sequences were highly diverse from one population to the next. Because modern humans originated in Africa, there has been more time for changes to accumulate in the African DNA sequences than there has been in other parts of the world, Tishkoff says.

It turns out that the San bushmen of southern Africa have the most distinct, and therefore oldest, genetic sequences, the team reports. The researchers theorize that the San homeland could be the spot where modern humans began their exodus from Africa to the rest of the world. This location, near the coastal border of Namibia and Angola in southwestern Africa, fits with previously proposed sites of the out-of-Africa migration. But the scientists note the area could just be where the San settled most recently.

The researchers are quick to point out that the data set is incomplete. “We analyzed 121 populations out of a possible 2,000,” says Tishkoff. Details of the analysis are sure to change as more information becomes available, but the study is a good starting point, the researchers say.

“We’re hoping to provide a framework for others to build on,” says Tishkoff.

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... and to add on along the same lines, check this out too...

www.telegraph.co.uk/scienceandtechnology/science/sciencenews/5299351/African-tribe-populated-rest-of-the-world.html


African tribe populated rest of the world

The entire human race outside Africa owes its existence to the survival of a single tribe of around 200 people who crossed the Red Sea 70,000 years ago, scientists have discovered.

Research by geneticists and archaeologists has allowed them to trace the origins of modern homo sapiens back to a single group of people who managed to cross from the Horn of Africa and into Arabia. From there they went on to colonise the rest of the world.

It is thought that changes in the climate between 90,000 and 70,000 years ago caused sea levels to drop dramatically and allowed the crossing of the Red Sea to take place.

Homo sapiens, known casually as "modern humans", are thought to have first evolved around 195,000 years ago in east Africa – the earliest remains from that time were uncovered near the Omo River in Ethiopia.

It is thought that by 150,000 years ago these early modern humans had managed to spread to other parts of Africa and fossilised remains have been found on the Cape of Good Hope in South Africa.

The earliest homo sapien remains found outside of Africa were discovered in Israel and are thought to be around 100,000 years old. They are remains of a group that left Africa through what is now the Sahara desert during a brief period when the climate grew wetter, turning the desert green with vegetation. This excursion, however, failed and the population died out when the climate started to dry out again.

..... damn! mad interesting just go on the website if you wanna read on
PEACE