DNA research just rewrote the origin of human species

DNA analysis of modern African groups, particularly the Nama people, reveals early humans evolved from multiple intermingling populations, not a single ancestral group. | Contesto: cronaca

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• DNA research just rewrote the origin of human species

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A groundbreaking genetic study has upended the long-held theory that modern humans descended from a single ancestral population in Africa, revealing instead that our species emerged from a complex web of intermingling groups over hundreds of thousands of years. Researchers analyzing DNA from diverse modern African populations, with a particular focus on the genetically distinct Nama people of southern Africa, found that early human populations began to diverge around 120,000 to 135,000 years ago but remained connected through continuous gene flow, challenging the traditional model of a clean evolutionary split. The study, published by an international team of geneticists and paleoanthropologists, combines genetic data from contemporary African groups with fossil evidence to reconstruct a more nuanced picture of human origins. The Nama people, known for their deep genetic lineage and unique linguistic heritage, provided crucial insights due to their long isolation from other African populations, preserving ancient genetic signatures that trace back to the earliest Homo sapiens. For decades, the prevailing scientific consensus held that all modern humans trace their ancestry to a single, relatively small population that lived in Africa roughly 200,000 years ago. This model, often called the "Out of Africa" theory, posited that this founding population then expanded and replaced other hominins across the globe. However, the new findings suggest a far more intricate scenario, where early human groups were not isolated branches but rather overlapping, interconnected populations that exchanged genetic material over vast periods. The implications of this research extend beyond academic curiosity, reshaping our understanding of human evolution and migration. If early humans evolved from multiple intermingling populations, it suggests that key adaptations—such as brain development, language, and tool use—may have emerged in different groups and spread through gene flow rather than arising in a single location. This could explain the patchwork of genetic and archaeological evidence that has long puzzled scientists, including the discovery of ancient fossils in different...

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Categoria: cronaca