A recent genetic study suggests that Neanderthals predominantly inherited modern human DNA from the females in their lineage due to mating preferences. Researchers from the University of Pennsylvania reached this conclusion by analyzing the X chromosomes of Neanderthals and comparing them to anatomically modern human DNA. This study sheds light on the social behavior of ancient populations.
Modern humans originated in Africa, while Neanderthals lived in Europe and Asia. Interbreeding between the two groups occurred multiple times, resulting in the presence of Neanderthal DNA in non-African human populations. The study focused on the presence of human DNA in Neanderthal X chromosomes, revealing a higher proportion of human genes in the X chromosomes compared to other chromosomes.
The study found that human DNA was more prevalent in regions of the X chromosome that were not actively involved in genetic functions. Unequal pairing and inheritance of the X chromosome from Neanderthal women with human ancestry could explain this phenomenon. Possible factors contributing to this include mate preferences, migration patterns, and natural selection of certain genes.
The researchers suggested that Neanderthal mating preferences may have been influenced by the appeal of modern human ancestry in either males or females. Various factors, such as migration patterns and genetic selection, may have contributed to the observed biases in Neanderthal X chromosomes.
Further studies have indicated potential challenges faced by Neanderthal-human hybrid offspring, such as decreased fertility and health issues. These findings suggest that ancient populations may have adapted their mating preferences based on observed outcomes in hybrid offspring.