The Major Transitions in Evolution Review

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(More customer reviews)This is arguably John-Maynard Smith's most challenging project in popular science writing. Written along with Eros Szathmary, a chemist, " The Major Transitions in Evolution" is written primarily for biology students, but can be understood by anybody with a solid background in evolutionary theory. How have the ways in which information is transmitted between generations changed through time and what were the crucial transitions that made these changes possible? One early example that illustrates the effect of these transitions is the origin of chromosomes. Nucleic acid strands (genes) capable of independent replication, at some point became linked and thereafter could replicate only as a set of lined genes (chromosomes). A new way of storing information,a new information system had evolved. How was this transition maintained through time? Would'nt unlinked genes which replicate faster be favoured by natural selection over linked genes? In effect, would'nt selection at a lower level disrupt higher level organizatins? This is a common feature of many of the major transitions and forms the fundamental theme of this marvellous book. In a series of chapters the authors discuss the evolutions of various level of complexity. The chapters are arrange in a logical sequence begining with the origin of life and moving on to successive transitions including the origin of the genetic code, the origin of the eucaryotes, the origin of sex, multicellularity, societies and language. The list here is not complete. I read the book from start to finish in a sequence, but readers with a good background in the subject could probably start anywhere depending on their interest. For non-biologist this is not easy reading at all, and I would imagine that even biology students will find portions challenging. An impressive quality of this book is the constant attempt to incorporate the pecularities of a particular system in developing an explanation to explain its origin. A discussion on the origin of the genetic code includes the possibilty that there could be a stero-chemical basis for specific amino acid-codon assigments, rather than it being a 'frozen accident'. Another example is whether there is a causal connection between haplodiploidy and evolution of sociality in eusocial insects. The author warn against making this apparently intuitive connection, and instead seek an explanation in split sex ratios and in some cases the particular features of insect ecology. The highlight of the book for me was the last chapter on the origin of language. From Noam Chomsky's work on the structure of grammer , syntax and language and representation, to an evolutionary explanation for its origin, this was really an informative essay. The ever recurring argument against the evolution of complex adapatations, in this case language, by a series of adaptive intermediate stages, has been dealt with using examples from animal speech, the genetics of language disorders and a section on the transitions from pigdin to creole. The book strikes a good balance between explaining theory and then discussing the experimental evidence available. Wherever possible, new experimental approaches are suggested. Finally, like any really good book on science the authors not only bring you up to date with what has been done, but also stress just how much more needs to be done. It is this feature about the book that leaves a lasting impression.

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Over the history of life there have been several major changes in the way genetic information is organized and transmitted from one generation to the next.These transitions include the origin of life itself, the first eukaryotic cells, reproduction by sexual means, the appearance of multicellular plants and animals, the emergence of cooperation and of animal societies, and the unique language ability of humans.This ambitious book provides the first unified discussion of the full range of these transitions. The authors highlight the similarities between different transitions--between the union of replicating molecules to form chromosomes and of cells to form multicellular organisms, for example--and show how understanding one transition sheds light on others.They trace a common theme throughout the history of evolution: after a major transition some entities lose the ability to replicate independently, becoming able to reproduce only as part of a larger whole.The authors investigate this pattern and why selection between entities at a lower level does not disrupt selection at more complex levels.Their explanation encompasses a compelling theory of the evolution of cooperation at all levels of complexity.Engagingly written and filled with numerous illustrations, this book can be read with enjoyment by anyone with an undergraduate training in biology.It is ideal for advanced discussion groups on evolution and includes accessible discussions of a wide range of topics, from molecular biology and linguistics to insect societies.

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