Neanderthal males, human females? How ancient attraction shaped the human genome‎

The human genome is a rich, complex record of migration, encounters, and inheritance written over thousands of millennia. Genomic research by members of Sarah Tishkoff's lab at the University of Pennsylvania are revisiting a particularly intimate chapter, suggesting that ancient mating patterns between modern humans and Neanderthals shaped why Neanderthal DNA is largely missing from the human X chromosome.