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LiveScience: “African hunter-gatherers are offshoots of earliest human split” Genomic study suggests the presence of ancient anatomically modern humans all over Africa.
Evolutionary anthropologists generally believe humans evolved in Africa and spread out from there. They have debated whether modern humans branched from the evolutionary tree in the eastern or southern parts of the continent. Analysis of the genomes of southern African people suggests instead that the modern human genome bears geographic footprints from many parts of the continent. Moreover, the study has identified a genetic variation that may also be associated with a genetic factor related to brow ridges in Neanderthals.
Both the Khoe and the San people are click-speaking tribes and share many traits. Historically the San were hunter-gatherers and the Khoe were herders. The researchers in this study, “Genomic Variation in Seven Khoe-San Groups Reveals Adaptation and Complex African History,” analyzed 2.3 million genetic variations among 220 people from 11 southern African population groups. Seven of these groups were Khoe-San people, and the variations among them formed a pattern that distinguished them from the others.
The Khoe-San genomes also share genetic components with far-distant African tribal groups, such as the east African Maasai, well-known for their cattle-herding. The researchers therefore suggest that east African herders brought their lifestyle and their genes to southern Africa in the distant past.
Evolutionists conventionally date modern humanity’s Out-of-Africa migration at about 60,000 years ago.
Evolutionists conventionally date modern humanity’s Out-of-Africa migration at about 60,000 years ago. The researchers in this study estimate the Khoe-San people diverged from other African populations long before, at about 100,000 years ago. Analysis of the genomic data suggests a later geographic split within this group, the northern and southern branches possessing some differences in the genes affecting the immune system. Based on the great diversity and apparently widespread genetic contributions, the authors conclude, “Both population structure and geographic distribution of genetic variation suggest a complex human population history within Africa.”1 They also say that anatomically modern humans must have already appeared before the Khoe-San people became somehow isolated and diverged from the rest of the African population.2
Anatomically modern humans lack the heavy brow ridges of Neanderthals. Some additional skeletal features of the collarbones and rib cage are also notable distinctions. One of the commonly occurring genetic variants in the Khoe-San people is a gene (RUNX2) known to affect bone and cartilage growth and thought possibly responsible for the unusual skeletal features of Neanderthals.3Therefore, the researchers keep open the possibility that the African genetic melting pot included archaic humans too.4
So what are we to make of all this? First of all, of course, no molecules-to-man evolution or evidence of ape-like ancestors is in view here. This study is purely concerned with variations among human populations. The huge ages cited (60,000 years and 100,000 years) are based on the usual unverifiable assumptions inherent in molecular clock dating.5
It is of course no surprise to find evidence that human ancestry is complex and intermingled. Even the link to the Neanderthal population, which is associated with Europe and Asia and which left a genetic footprint in our modern genome, is no surprise. All people are descended from Adam and Eve through Noah’s family. When the rebellious people of the post-Flood world dispersed from the Tower of Babel, they were already related. The results are consistent with the biblical history of humanity after the Flood.
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