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Facial features and the behaviors of people with this syndrome strongly tend toward the friendlier end of the human spectrum. To uncover this link, investigators used cells from people with a well-characterized genetic condition called Williams-Beuren syndrome. Previous studies circled around genes potentially linked to domestication in humans, he says, but the “critical advance” of the new paper is that it takes one important gene candidate and ties it to a predicted result of domestication: finer facial features. These differences would be expected if modern humans are a self-domesticated species, says Richard Wrangham, a professor of biological anthropology at Harvard University, who was not involved in the work.
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The results show that DNA changes underlying facial development differ distinctly between today’s humans and our closest extinct relatives, the Neandertals and Denisovans-another ancient branch of the human family tree. But genetic evidence linking facial characteristics to this self-domestication process has been scant.Ī new study published on December 4 in Science Advances provides a missing link. This idea suggests that as humans increasingly relied on peaceable social interactions to flourish, our ancestors began selecting mates with less aggressive features for facial appearance and other traits. One hypothesis for how humans transitioned from developing a robust Neandertal visage in maturity to retaining finer features throughout life is that we “self-domesticated” our face. Although many primates begin life with this more delicate appearance, we are the only ones to retain it into adulthood. By comparison, our eyes, nose and mouth are narrower and take up less facial real estate. And I don't think we know anymore what does.Depictions of Neandertals, our erstwhile occasional mating partners, usually include facial features that are broader and thicker than ours, with a sloping, shorter forehead and beetle brow.
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"It absolutely questions what makes us human.
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"We have just encountered another species that perhaps thought about its own mortality, and went to great risk and effort to dispose of its dead in a deep, remote, chamber right behind us," he told CNN. The findings, led by University of the Witwatersrand professor Lee Berger, could potentially represent the answer to science's long quest to uncover the so-called "missing link." The idea of a "link," or transitionary fossil linking modern humans to our primal ancestors, has fallen out of favor in recent years as it is often taken to falsely suggest a "linear evolutionary history," according to Scientific American.įor Berger, the appearance of a deliberate burial ritual was the most surprising of his finds. So far, it is unclear how old the bones are. "Representing at least 15 individuals with most skeletal elements repeated multiple times, this is the largest assemblage of a single species of hominins yet discovered in Africa," the study reported. Researchers in South Africa have discovered a new species of ancient human, the science journal eLife reported Thursday.Īrcheologists unearthed the skeletal remains of what is being called Homo naledi within a burial chamber of the country's Rising Star cave system.
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