Ancient Humans
Genetic analysis suggests that interbreeding between Neanderthals and Homo sapiens involved mostly male Neanderthals and female modern humans. Researchers examined sex chromosomes to uncover this pattern, which occurred during multiple periods after humans left Africa. The findings point to mating preferences as the likely explanation, though experts call for more evidence.
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A discovery of Paranthropus remains in northern Ethiopia has revealed that the ape-like hominins inhabited a broader geographic area than previously thought. The 2.6-million-year-old jawbone and tooth, unearthed in the Afar region, suggest these early humans adapted to diverse environments. This finding challenges earlier views of their limited versatility.
A new study suggests that interbreeding between Neanderthals and Homo sapiens created a genetic incompatibility that increased pregnancy failure risks in hybrid mothers, potentially contributing to Neanderthals' extinction. This mismatch involved differences in the PIEZO1 gene affecting oxygen transport in blood. The finding could explain the absence of Neanderthal mitochondrial DNA in modern humans.
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A study of fossil teeth reveals that prehistoric hominids were exposed to lead for at least 2 million years, potentially influencing brain evolution. Modern humans appear to have adapted better to the toxin than relatives like Neanderthals, according to research using ancient samples and brain organoids. However, some experts question the extent of this exposure and its evolutionary implications.