Richard Lewontin's The Triple Helix: Gene, Organism, and Environment PDF

By Richard Lewontin

ISBN-10: 0674006771

ISBN-13: 9780674006775

one in every of our so much superb evolutionary biologists, Richard Lewontin has additionally been a number one critic of those--scientists and non-scientists alike--who might misuse the technology to which he has contributed rather a lot. In The Triple Helix, Lewontin the scientist and Lewontin the critic come jointly to supply a concise, obtainable account of what his paintings has taught him approximately biology and approximately its relevance to human affairs. within the method, he exposes many of the universal and troubling misconceptions that misdirect and stall our knowing of biology and evolution.

The critical message of this booklet is that we'll by no means absolutely comprehend residing issues if we proceed to think about genes, organisms, and environments as separate entities, each one with its particular position to play within the heritage and operation of natural approaches. the following Lewontin exhibits that an organism is a distinct end result of either genes and atmosphere, of either inner and exterior gains. Rejecting the idea that genes make certain the organism, which then adapts to the surroundings, he explains that organisms, stimulated of their improvement via their situations, in flip create, regulate, and select the surroundings within which they dwell.

The Triple Helix is classic Lewontin: fabulous, eloquent, passionate, and deeply serious. however it is neither a manifesto for a thorough new method nor a short for a brand new thought. it truly is as an alternative a primer at the complexity of organic procedures, a reminder to we all that residing issues are by no means so simple as they could look.

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Extra resources for The Triple Helix: Gene, Organism, and Environment

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J. , 18: 3386–3403. G. and Kurz, J. (1985) An analysis of the origins of the cholinergic and noncholinergic septal projections to the hippocampal formation of the rat. J. Comp. , 240: 37–59. G. (1978) A Golgi study of cell types in the hilar region of the hippocampus in the rat. J. Comp. , 182: 851–914. G. and Lavenex, P. (2007) Hippocampal neuroanatomy. , Bliss T. and O’Keefe J. ), The Hippocampus Book. Oxford University Press, New York, p. 872. G. P. (1989) The three dimensional organization of the hippocampal formation: a review of anatomical data.

A prototypical pyramidal basket cell is shown after intracellular injection of Neurobiotin. The montage that was created after visualization of the cell (A) and line drawing (B) illustrate the characteristics of this cell type. An arrow points to the axon. Calibration bar ¼ 25 mm (A), 40 mm (B). 13 Fig. 8. The mossy cell. A line drawing of a mossy cell (mc) in the polymorphic layer. The axon (arrow) develops a plexus within the polymorphic layer, and also an ipsilateral projection to the inner molecular layer, known as the associational pathway.

While thorny excrescences are also observed on the proximal dendrites of CA3 pyramidal cells, they are never as dense or as complex as the ones on the mossy cells. The distal dendrites of the mossy cell have typical pedunculate spines that appear to be less dense than those on the distal dendrites of the hippocampal pyramidal cells. Mossy cell projections The inner third of the molecular layer (Fig. , 1992, 1996). Since, in the rat, this projection originates both in the ipsilateral and contralateral sides of the dentate gyrus, it has been called the associational/commissural projection.

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The Triple Helix: Gene, Organism, and Environment by Richard Lewontin

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