for several thousands of years but they never integrated sufficiently to produce a thoroughly mixed hybrid. This is despite evidence of interbreeding between the two different human species - with todays humans possessing between 2.5% and 4% of Neanderthal DNA. Researchers from Stanford University have claimed it is telling that no-one contains the DNA from the Neanderthal male Y chromosome, which is only transmitted from father to son. Our
ancestors and their Neanderthals neighbours may have been kept apart because they had incompatible male genes, new research suggests (Image: Getty) One reason could be that Neanderthal Y chromosome genes are incompatible with other human genes, according to the new study. This may have led to miscarriages and prevented the birth of hybrid male babies. As a result, the Neanderthal Y chromosome would eventually have exited the human gene pool. Read more: Read MoreRelated ArticlesBritish diver finds 500-year-old shipwreck belonging to legendary Portugese explorer Vasco da Gama Professor Carlos Bustamante, from Stanford University in the US, who co-led the study - the first to investigate the Neanderthal Y chromosome -
said: Weve never observed
the Neanderthal Y chromosome DNA in any human sample ever tested. That doesnt prove its totally extinct
, but it likely is. The functional nature of the mutations we found suggests to us that Neanderthal Y chromosome sequences may have played a role in barriers to gene flow, but we need to do experiments to demonstrate this and are working to plan these now. When members of our human species Homo sapiens migrated o广东快乐十分走势图表 基本图表百度 ut of Africa around 70,000 years ago they found Neanderthals already living in Eurasia. We are not as closely linked to Neanderthal man as previously thought, the study suggests (Image: PA) The Neanderthals had evolved from earlier ancestors which had themselves originated in Africa. The new Y chromosome research shows that the last common ancestor of Neanderthals and early modern humans lived around 550,000 years ago. Several Ne
anderthal Y chromosome genes that were found to differ from those of modern humans function as part of the immune system. Read more: Read MoreRelated ArticlesMysterious new dwarf human species probed after scientists f
ind 3 million year old skull in cave One of the Y chromosome mutations seen in Neanderthals, which occasionally also occurs in modern humans, is known to lead to transplant rejection when men donate organs to women. Theoretically, a woman carrying a male foetus with similar Neanderthal Y genes could have rejected the baby in her womb, causing her to miscarry, say the scientists. The research is reported in The Ame
rican Journal of Human Genetics.