Around 200,000 years ago, a man--identical to us in all important respects--lived in Africa. Every person alive today is descended from him. How did this real-life Adam wind up father of us all? What happened to the descendants of other men who lived at the same time? And why, if modern humans share a single prehistoric ancestor, do we come in so many sizes, shapes, and races?
Showing how the secrets about our ancestors are hidden in our genetic code, Spencer Wells reveals how developments in the cutting-edge science of population genetics have made it possible to create a family tree for the whole of humanity. We now know not only where our ancestors lived but who they fought, loved, and influenced.
Informed by this new science, The Journey of Man is replete with astonishing information. Wells tells us that we can trace our origins back to a single Adam and Eve, but that Eve came first by some 80,000 years. We hear how the male Y-chromosome has been used to trace the spread of humanity from Africa into Eurasia, why differing racial types emerged when mountain ranges split population groups, and that the San Bushmen of the Kalahari have some of the oldest genetic markers in the world. We learn, finally with absolute certainty, that Neanderthals are not our ancestors and that the entire genetic diversity of Native Americans can be accounted for by just ten individuals.
It is an enthralling, epic tour through the history and development of early humankind--as well as an accessible look at the analysis of human genetics that is giving us definitive answers to questions we have asked for centuries, questions now more compelling than ever.
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Luckily for the male ego and population geneticists it turns out that blokes also have some unique chromosomal hand baggage hidden away in the non-recombining part of the Y chromosome. Like female mitochondrial DNA it is passed solely between father and son and is particularly useful for studying human diversity. This is because it is so big--much bigger than mitochondrial DNA--and accumulates mutations at particular sites that can be relatively easily identified. By sampling the Y chromosome from men around the world the modern human diaspora can be mapped out both geographically and chronologically.
Spencer Wells is an American geneticist with impeccable credentials from Harvard, Stanford and Oxford universities and certainly knows his subject. Fortunately, he is also very good at explaining the science, which can be somewhat complicated at times. This fascinating and often surprising story originated as a television film and has benefited from being thoroughly worked out through first-hand experience around the world.
Accompanied by 24 pages of brilliant photos by Mark Read, an excellent list of further reading and an index, The Journey of Man is well worth getting to grips with. As Wells points out, each of us carries a unique chapter locked away inside our genome, and we owe it to ourselves and our descendants to discover what it is. Come on boys, this is our story and we ought to know the gist of it. Douglas Palmer
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