Download Acquiring Genomes: A Theory of the Origins of Species by Lynn Margulis PDF

By Lynn Margulis

During this groundbreaking e-book, Lynn Margulis and Dorion Sagan current a solution to 1 of the long-lasting mysteries of evolution--the resource of inherited edition that provides upward push to new species. Random genetic mutation, lengthy believed to be the most resource of edition, is simply a marginal issue. because the authors display during this ebook, the extra very important resource of speciation, by means of a long way, is the purchase of recent genomes via symbiotic merger. the results of thirty years of delving right into a substantial, in general arcane literature, this can be the 1st booklet to head beyond--and show the critical obstacles of--the "Modern Synthesis" that has ruled evolutionary biology for nearly 3 generations. Lynn Margulis, whom E. O. Wilson known as "one of the main profitable man made thinkers in sleek biology," and her co-author Dorion Sagan have written a finished and scientifically supported presentation of a concept that at once demanding situations the assumptions we carry in regards to the number of the dwelling international.

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Extra info for Acquiring Genomes: A Theory of the Origins of Species

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In their later article, Ansermet and Magistretti complexify the relationships between the synaptic trace and the body by retaining from Damasio’s model only the necessity for homeostasis, which they subject to a profound transformation by linking it to the Freudian pleasure principle. The trace is not only the effect of the organism’s experience of meeting the outside, it comes from the body’s inside too (which is also “in exteriority” with respect to the system of traces), to the extent that, as the authors argue, the brain acts upon the body in order to maintain homeostasis.

Moshe Szyf, of McGill University in Montreal, studies the effect of maternal care on epigenetic imprinting. As he explained at this week’s meeting on Epigenetics and Neural Development Disorders, held in Beltsville, Maryland, imprinting might be a general mechanism whereby experiences are translated into behaviour. If that turns out to be so, it will affect understanding and treatment of mental illness. (The Economist, 2006b, pp. 78–79) For the moment, the impact of epigenetic imprinting is limited to the first week of life after birth.

477) The lessons that the authors draw from this non-preservation of experience on the basis of traces are twofold. On one hand, this nonpreservation constitutes the foundation of the inscription of the singularity of each subject’s experience when faced with an internal or external stimulus. Through the unique interplay mediated by the re-association of traces, the universal mechanisms of plasticity result in the production of a unique subject, each time different. One could say that in this way and paradoxically plasticity implies a determination of the unpredictable.

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