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This entertaining and thought-provoking book is an excellent illustration of why the study of evolution is in such an exciting ferment these days. (Science )
Science
This is a work of unabashed advocacy. Read the first page
Concordance
Front Cover | Copyright | Table of Contents | Excerpt | Index
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This book was marketed as the sequel to The Selfish Gene, and chronologically it certainly was. However, the book is far more scholarly in its approach and for that reason is different in tone from Dawkins' other major works. Dawkins states at the outset that he is writing primarily for the professional biologist, but that anyone who makes the effort may understand and enjoy the work (I paraphrase).
This is true. With occasional reference to the helpful and educational glossary provided at the back of the book, I found it easy to make progress, to enjoy and to follow the arguments presented. I highly recommend this to all professionals, and to all others who may have read Dawkins' other works and feel ready to go deeper.
This is a really good treatment of that subject - you are unlikely to find any better.
This book follows on from "The Selfish Gene" and in it, Dawkins argues that the phonotypic effects of genes do not stop at the limits of the organisms that carry them. He suggests, for example, that the phenotypic expression of beaver genes stretch right to the edges of the lakes formed by their dams and the genes of some parasites are expressed in their hosts. So a snail might behave in a manner that puts itself in harm's way because the fluke living inside it has, somehow, managed to modify the snail's behaviour for its own ends - say to continue its life cycle inside one of the snail's predators. That is to say, the snail's behaviour is maximizing the survival of fluke genes rather than snail genes. He puts it very succinctly: 'an animal's behaviour tends to maximize the survival of the genes "for" that behaviour, whether or not those genes happen to be in the body of the particular animal performing it.' There are plenty of other fascinating examples of this sort. There are chapters covering such intriguing areas as evolutionary 'arms races', 'outlaw' genes and 'jumping' genes. Good use is made of thought experiments to help to figure out how and why certain adaptations might have evolved. 'Outlaw' genes for instance, might try to cheat the system to get themselves replicated more than their alleles, so how can the rest of the genome fight back? I particularly liked the idea of the 'green-beard effect' whereby genes might make the organism (not necessarily a man) carrying them recognisable to other organisms carrying that gene so that all the organisms carrying the 'green beard' gene would be altruistic towards each other but not to non-green-bearded organisms.
It's not the usual easy read. As the author points out, 'this book ... assumes that the reader has professional knowledge of evolutionary biology and its technical terms'. However, it's well worth the effort of struggling with it if you're interested in evolution and Richard Dawkins ideas about how it all works. If you've read "The Selfish Gene" and found it riveting, you'll probably enjoy this too.
The 'extended phenotype' is an elaboration of the selfish gene principle, in which the target of selection is the gene (the... Read more
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