The Journey of Man: A Genetic Odyssey Paperback – Feb 17 2004
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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 --This text refers to an alternate Paperback edition.
From Publishers Weekly
In this surprisingly accessible book, British geneticist Wells sets out to answer long-standing anthropological questions of where humans came from, how we migrated and when we arrived in such places as Europe and North America. To trace the migration of human beings from our earliest homes in Africa to the farthest reaches of the globe, Wells calls on recent DNA research for support. Clues in the blood of present groups such as eastern Russia's Chukchi, as well as the biological remnants of long-extinct human clans, allow Wells to follow the Y chromosome as a relatively unaltered marker of human heritage. Eventually, working backward through time, he finds that the earliest common "ingredient" in males' genetic soup was found in a man Wells calls the "Eurasian Adam," who lived in Africa between 31,000 and 79,000 years ago. Each subsequent population, isolated from its fellows, gained new genetic markers, creating a map in time and space. Wells writes that the first modern humans "left Africa only 2,000 generations ago" and quickly fanned out across Asia, into Europe, and across the then-extant land bridge into the Americas. Using the same markers, he debunks the notion that Neanderthals were our ancestors, finds odd links between faraway peoples, and-most startlingly-discovers that all Native Americans can be traced to a group of perhaps a dozen people. By explaining his terminology and methods throughout the book, instead of in a chunk, Wells makes following the branches of the human tree seem easy. 44 color photos, 54 halftones and 3 maps.
Copyright 2003 Reed Business Information, Inc. --This text refers to the Hardcover edition.
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Top Customer Reviews
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.Read more ›
In part, the book is a summary of refutations against the ideas of anthropologists who maintained that different races were subspecies that arose in different regions at different times. No such hypotheses could be tested in the time they were issued, and now they can. DNA in the cells from mitochondria, and the DNA in the male Y chromosome do not shuffle the way ordinary chromosomes do, and thus are very stable from one generation to the next. Mutations happen, and accumulate, and may be used to see how closely related humans from different regions of the world are. The genetic results of both mitochondrial and Y chromosome research confirm each other, and are unambiguous. We are all out of Africa. We stayed in Africa as humans for generations, and almost all the genetic variation we were going to get was within us at that time. Then around 40,000 years ago, propelled perhaps because of weather changes, we started our travels.Read more ›
Most recent customer reviews
This author explains the scientific theory of genetic evolution in a language that is easily understandable. Read morePublished 2 days ago by george nightingale
Well written and explained by the author. If you never cared who your ancestors were before reading this, you will after. Read morePublished 17 months ago by Eilleen
I loved to size of the book so much easier for an old lady who loves to read in bed. As always the book was here before I knew it. Amazon does a great job.Published on July 26 2013 by JOANWW
One doesn't learn a lot about evolutionary genetics from this book. When the author talks about how statisticians arrive at a result he does a really poor job of explaining the... Read morePublished on July 17 2004
I just had a blast reading this book. What a load of fun! The fact that we can divine the details of our origins and travels from the minute variations in our Y chromosomes and... Read morePublished on May 9 2004 by Robert C. Martin
Self proud humans with basic understanding of biology cannot even imagine that 50-60,000 yrs or up to 150,000 (or more) ago we all came from one man and one woman who mated, until... Read morePublished on March 28 2004 by guy performer
If you didn't think that there was much conclusive evidence in the study, maybe you should say so and you have every right to point it out. Read morePublished on Jan. 15 2004
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