Download e-book for iPad: Beyond the Gene: Cytoplasmic Inheritance and the Struggle by Jan Sapp

By Jan Sapp

ISBN-10: 0195042069

ISBN-13: 9780195042061

The scope and value of cytoplasmic inheritance has been the topic of 1 of the longest controversies within the background of genetics. within the first significant publication at the heritage of this topic, Jan Sapp analyses the power makes an attempt of investigators of non-Mendelian inheritance to set up their claims within the face of sturdy resistance from nucleo-centric geneticists and classical neo-Darwinians. a brand new point of view at the background of genetics is obtainable as he explores the conflicts that have formed theoretical puzzling over heredity and evolution in the course of the century: materialism vs. vitalism, reductionism vs. holism, preformation vs. epigenesis, neo-Darwinism vs. new-Lamarckism, and gradualism vs. saltationism. In so doing, Sapp highlights aggressive struggles for energy between members and disciplinary teams. He accepts that political pursuits and normal social contexts might without delay have an effect on medical rules, yet develops the more suitable thesis that social pursuits inside of technology itself are consistently all in favour of the content material of clinical wisdom. He is going directly to exhibit that there aren't any impartial judges in clinical controversies and investigates the social innovations and methodological rhetoric utilized by scientists once they shield or oppose a selected conception. whilst, Sapp illustrates the social constraints that make sure the excessive price and threat of pleasing unorthodox theories within the sciences.

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Additional info for Beyond the Gene: Cytoplasmic Inheritance and the Struggle for Authority in Genetics (Monographs in the History and Philosophy of Biology)

Sample text

As E. B. Wilson stated in 1928, the idea itself was not new. What was new was the impetus for its further investigation. Intense cytological studies indicated that mitochondria consisted of specific material having definite cytological and chemical characteristics. Unlike the mechanical behavior of chromosomes, however, mitochondria seemed to be morphologically highly plastic, so that they could appear under different forms. They were identified in both eggs and sperm, and in blastomeres of the segmenting egg, and E.

The possibility of such changes in the unsegmented egg, Conklin argued, was well illustrated by the case of inverse symmetry. In many groups of animals certain species or individuals existed in which there was a total inversion of all organs and parts with respect to the plane of symmetry. Cases of inverse symmetry had been observed in humans where all the viscera were transposed with regard to the median plane. The heart and great arch of the aorta were found on the right side instead of the left.

The question of whether cytoplasmic organizational fields and the cytoplasmic substance that responded to them were ultimately traceable to the action of the nucleus, or whether they constituted part of the orginal germ, remained a subject of controversy throughout the century. In the meantime, Boveri had constructed an experimental procedure which was designed to test the relative roles of the nucleus and the cytoplasm in heredity. The experiment that Boveri constructed, which to many embryologists conclusively demonstrated that cytoplasmic inheritance did occur, became famous as "merogonic hybridization" (see Delage, 1899).

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Beyond the Gene: Cytoplasmic Inheritance and the Struggle for Authority in Genetics (Monographs in the History and Philosophy of Biology) by Jan Sapp

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