Scientists Find Two Unknown 'Ghost' Ancestors Hiding in Our DNA
Two long-forgotten relatives of humans are still present in our genes, revealing a much richer evolutionary history than previously known. The discovery strengthens the idea that human evolution is a long process of mating and interacting with other hominins that are close to humans.
Scientists have previously found signs that Homo sapiens mated not only with Neanderthals and Denisovans, but also with other early humans. Now researchers from the University of California Berkeley have found the particular genes of mysterious ancestors in human DNA and the time when the mating occurred. The team made the discovery using a new method that examines hundreds of present-day human genomes and reconstructs ancient genealogical connections among their DNA sequences.
A Ghost Ancestor Shared by All Humans
One of the unknown groups, described by the researchers as a ghost ancestor, interbred with modern humans in Africa more than 50,000 years ago. This mating occurred before the last migration of Homo sapiens from Africa to Europe and Asia. DNA inherited from the ‘ghost’ comprise about 1% of modern humans’ genes, the same share of genes as Homo sapiens share with Neanderthals.
The ghost lineage separated from the ancestors of modern humans around 800,000 years ago, close to the time when Neanderthals and Denisovans also split from one another. However, the ghost population exchanged genes with modern humans at an earlier point than the Neanderthal and Denisovan encounters outside Africa.
www.Ancient-Origins.net – Reconstructing the story of humanity’s past
Source: https://www.ancient-origins.net/news-evolution-human-origins/ghost-ancestors-human-dna-00103048
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