Interbreeding With Denisovans

Ancient humans known as Denisovans only interbred with modern humans after they both crossed the Wallace Line. This may explain why DNA from these ancient humans is only found in people from some parts of Southeast Asia, Papua New Guinea and in Australian Aborigines. Evidence of the now-extinct human relative was first found in a Siberian cave three years ago. Since then, genetic studies have revealed they interbred with modern humans. But while traces of Denisovan DNA have been found in Southeast Asia, they have not been found in mainland Asian populations, which is closer to where the original fossils were found.