Learn how sex-biased interbreeding between Neanderthals and modern humans explains why Neanderthal DNA is largely missing from the X chromosome.

Long ago, Neanderthals and humans interbred. But among Neanderthals, their human blood came mostly from their female ancestors, and a new genetic study finds this was likely due to their mating preferences.

When Neanderthals and ancient modern humans interbred, the pairings were mostly between male Neanderthals and female humans. This finding helps

Two of the traits that set modern humans apart from non-human primates are taller stature and a higher basal metabolic rate. Researchers have identified a genetic variant that contributed to the co-evolution of these traits. This mutation seems to help ...