A recent genetic study suggests that Neanderthals predominantly inherited modern human DNA from their female ancestors due to mating preferences within Neanderthal populations. Researchers from the University of Pennsylvania analyzed Neanderthal X chromosomes to determine the proportion of anatomically modern human (AMH) DNA present. The findings, published in the journal Science, shed light on the social dynamics of ancient populations.
Contrary to the common belief that modern humans originated in Africa while Neanderthals inhabited Europe and Asia, interbreeding between the two groups resulted in the exchange of genetic material. The study focused on the unequal distribution of human DNA in Neanderthal X chromosomes, with a significant presence in comparison to other chromosomes.
Examining X chromosomes from ancient Neanderthal women and modern human women from sub-Saharan Africa, researchers observed a higher percentage of human DNA in the Neanderthal X chromosomes. The study suggested that human genes on the X chromosome may have been more advantageous for Neanderthals, leading to their prevalence over Neanderthal genes. Unequal mating patterns, specifically involving men with more Neanderthal ancestry and women with more human ancestry, could explain the genetic asymmetry.
The researchers proposed various factors, including mate preferences, migration patterns, and natural selection, as contributors to the observed biases in Neanderthal X chromosomes. Additional studies have indicated potential challenges for Neanderthal-human hybrid offspring, such as health issues and reduced fertility, influencing mating choices among ancient populations.
Damian Labuda, a retired professor, commended the study’s findings, emphasizing the complexity of factors influencing breeding patterns among Neanderthals. He highlighted the observational skills and intelligence of ancient Neanderthals in recognizing genetic implications for offspring health and fertility, potentially shaping their mating behaviors and societal norms.