Product Description

Around 60,000 years ago, a man, identical to us in all important respects, walked the soil of Africa. Every man alive today is descended from him. How did he come to be father to all of us - a real-life Adam? And why do we come in such a huge variety of sizes, shapes, types and races if we all share a single prehistoric ancestor? In this fascinating book, Spencer Wells shows how the truth about our ancestors is hidden in our genetic code, and reveals how developments in the cutting-edge science of population genetics have made it possible not just to discover where our ancestors lived (and who they may have fought, loved, learned from and influence) but to create a family tree for the whole of humanity.

Product Details

• Amazon Sales Rank: #62145 in Books
• Published on: 2003-05-29
• Original language: English
• Binding: Paperback
• 240 pages

Amazon.co.uk Review
The Journey of Man is not just some old fashioned sexist travelogue about a bloke in shorts and sandals wandering the byways of the world. As the subtitle explains, it is "a genetic odyssey" of men rather than women. We have heard a lot about the matriarchal "African Eve". As Spencer Wells says, we all have an African foremother who lived approximately 150,000 years ago. She handed down her genetic mitochondrial "handbag" specifically to her daughter and on over the generations and millennia. But what about the male contribution to today's human genome?

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

From the Inside Flap
"Written with much verve, easy to read, and up-to-date on many important developments." (Luigi Luca Cavalli-Sforza, Stanford University, author of The History and Geography of Human Genes and Genes, Peoples, and Languages.)

"Spencer Wells, whose genetic work has contributed to our understanding of human prehistory, has provided the lay reader with an account of the spread and mixing of the human species from its origin in Africa that is both scientifically accurate and accessible to the nonscientist. In achieving that accessibility, he has not made the common error of confusing simple explanations with simplistic ones. Most important, Wells has the intellectual integrity, all too rare in popularizations of science, to distinguish what is really known from what is only speculation." (Richard Lewontin, Harvard University, author of It Ain't Necessarily So: The Dream of the Human Genome and Other Illusions.)

About the Author
Spencer Wells received his Ph.D. from Harvard University in 1994, and subsequently moved to Stanford University, where he worked with Luca Cavalli-Sforza. He then led the population genetics research group at the Wellcome Trust Centre for Human Genetics at Oxford.

Customer Reviews

"Y" is the answer - not the question
A few years ago a furor arose over the announcement that a calculation of mitochondrial DNA mutation rate formulated an "African Eve". Since then other genetic ancestral studies have been undertaken. Most notable of these was the determination that Neanderthal was not a direct ancestor of modern humans. Spencer Wells provides an enthralling overview of the research tracking changes in the Y [male] chromosome. The studies verify again that our origins are African. Somewhere, around 60 000 years ago, lived one man, a flesh and blood individual, from whom we've all descended. His progeny, in an amazingly short span, scattered around the globe. The scattering isn't news, but the verification of the paths and chronology is lucid and vividly outlined in this book.

The key to the tracking, as Wells makes abundantly clear, are various polymorphisms [changes] in the Y chromosome. These mutations are reflected in today's populations and the rate of their diversity indicates the approximate age of the various regional groups. These changes, nearly all prefixed "M" [male?] are used as ingredients in recipes Wells offers as illustrative metaphor. It's a clever ploy, so long as you remember ingredients may only be added, never removed nor replaced. That's how genetics works, he reminds us. He portrays the build-up of recipe ingredients with maps and diagrams. The diagrams are almost redundant as the clarity of his prose enables you to envision them.

Following the paths of migration, Wells shows how some archaeological finds offer support for the patterns he sees. Fossils are rare, elusive and sometimes misunderstood. Genetics, buried deep in our cells, are unequivocal in providing their evidence. Dating methods are briefly described and their shortcomings mercilessly paraded. Wells doesn't give the paleoanthropologists much voice. His story needs telling and the reader may go elsewhere for countering information. Yet he acknowledges the importance of confirming information from various digs around the world.

Wells firmly addresses a great anomaly - if modern humans arose from the evolutionary bouillabaisse about 60 millennia ago, how did the Aborigines arrive in Australia at nearly the same time? His answer is that the track followed shore routes, not inland ones. Hunter-gatherer groups, subject to the whims of climate, food resources and population pressure took the softest trail. Africa to Australia during ice ages was a gentle, if lengthy, stroll.

Nit-picking department: Wells' opening gun is turned on the racial "expert" Carleton Coon, who asserted the human races each followed a separate evolutionary path. Coon has been refuted in so many ways by so many researchers, Wells' effort seems superfluous. There are more competent scientists adhering to the "Multiregional" thesis. Some of these researchers might have been given a small voice in an annotated bibliography. While Wells offers a reading list for each chapter, a full bibliography would be an enhancement. Many of his references are remote. That doesn't tarnish the value of this book. [stephen a. haines - Ottawa, Canada]

Shading light to the dark
This book is fantastic genetic research on human history. Answering many questions and shading light to the darkness of general knowledg of physical differences.