The scientists from the Estonian Biocentre, University of Tartu discovered that humans spread around the world in a single wave of migration. The DNA chain shows that evidence for an earlier wave of migration more than 100,000 years ago, as a trace of ‘old’ DNA embedded within the genomes of Aboriginal people from Australia and the Philippines.
The scientists found out that anatomically modern humans arose in Africa around 200,000 years ago. The studies have mapped 787 new genomes from more than 280 different populations from as many as possible places of the planet. This group included genomes of aborigines from Basques, Pygmies, Bedouins, Pima Indians, Sherpa, and Australian Aborigines.
Old African DNA embedded in the chromosomes, and their results of the study show that all non-African peoples today are descendants from early humans who left Africa in a single wave of migration. As noted Professor Mait Metspalu, Director at the Estonian Biocentre:
“We find a small footprint—at least two per cent—of a previous migration in the genomes of people from Papua New Guinea. If everyone alive today came out of Arica at the same time, then we should all have the same split-time.”
In short, just the two per cent comes from an older population of humans who probably lived around 120,000 years ago.