- Pangenesis
Refimprove date July 2007 Pangenesis was Charles Darwin s hypothetical mechanism for heredity . He presented this provisional hypothesis in his 1868 work The Variation of Animals and Plants under Domestication and felt that it brought together a multitude of facts which are at present left disconnected by any efficient cause . The etymology of the word comes from the Greek language Greek words pan a prefix meaning whole , encompassing and genesis birth or genos origin . Much of Darwin s pangenesis theory was speculatively based on inheritance of tiny heredity particles he called gemmules that could be transmitted from parent to offspring. Darwin emphasized that only cells could regenerate new tissues or generate new organisms. He posited that atomic sized gemmules formed by cells would diffuse and aggregate in the reproductive organs. ref name Darwin68 cite book last Darwin first Charles year 1868 title The variation of animals and plants under domestication publication place London publisher John Murray url http darwin online.org.uk content frameset?itemID F880.1&viewtype text&pageseq 1 accessdate 2011 08 11 ref harv isbn 1 4191 8660 4 ref Overview Darwin s pangenesis theory was complex as he tried to explain the process of sexual reproduction, passing of traits and complex developmental biology developmental phenomena, such as cellular Regeneration biology regeneration . ref name ... of his hypothesis of pangenesis journal J Hist Med Allied Sci volume XXIV issue 4 pages 375 411 doi ... 6 ref His pangenesis theory was criticised for its Lamarkism Lamarckian premise that parents could ... of Darwin s pangenesis principles in this regard do relate to heritable aspects of phenotypic plasticity ... of pangenesis. In consultation with Darwin, he set out to see if gemmules were transported in the blood ... 1 where he wrote Now, in the chapter on Pangenesis in my Variation of Animals and Plants under Domestication ... Evolution Maupertuis as Pangenesis precursor References Bulmer M. G. Francis Galton Pioneer of heredity ... more details
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- Gemmule (pangenesis)
blockquote Pangenesis looked to him as if it might supply the answer. Darwin proposed that some ... characteristics. Pangenesis gave him the chance to be Lamarckian without any of Lamarck s inner ... blockquote No doubt the whole hypothesis of pangenesis was extremely complicated, he conceded ... in good faith, intending to prove Darwin right and he praised pangenesis in Hereditary Genius in 1869 ... of his Pangenesis theory. This appeared in his book The Variation of Animals and Plants under ... more details
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- Gemmule
About the internal buds of freshwater sponges the proposed mechanism of heredity Gemmule pangenesis Gemmules are internal bud s found in sea sponge sponge s that are the result of asexual reproduction , and are a response to a hostile environment.They are resistant to desiccation drying out , freezing, and Hypoxia medical anoxia lack of oxygen and can lie around for long periods of time. These are similar to a bacterium s endospore . Gemmules are made up of amoebocytes surrounded by a layer of Sponge spicule spicules and can survive conditions that would kill adult sponges. When the environment becomes less hostile, the gemmule resumes growing. References Feldkamp, Susan 2002 . Modern Biology. United States Holt, Rinehart, and Winston. p. 695. Accessed on May 23, 2006. Category Poriferans fr Gemmule sr ... more details
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- Federico Delpino
. R., 5 Sept 1867 http darwin online.org.uk content frameset?itemID F1748b&viewtype text&pageseq 1 Pangenesis ... more details
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- The Variation of Animals and Plants under Domestication
contains in Chapter XXVII a description of Darwin s theory of heredity which he called pangenesis ... which he called pangenesis and asking whether he should publish it. In his accompanying letter ... pointed out the similarities of pangenesis to the theories of Georges Louis Leclerc, Comte de Buffon ... rummaging among your papers half a century hence will find Pangenesis & say See this wonderful anticipation ... XXVI. Laws of variation, continued summary. Chapter XXVII. Provisional hypothesis of pangenesis. Chapter ... of pangenesis that he had first outlined to Huxley in 1865. ref For a discussion of how Darwin ... feedback from his friends on their views on pangenesis. In October 1867 before the book was published ... call Pangenesis will be called a mad dream, and I shall be pretty well satisfied if you think it a dream ... be intensely anxious to hear what you think about Pangenesis ref citation url http www.darwinproject.ac.uk ... think of Pangenesis . ref citation url http www.darwinproject.ac.uk darwinletters calendar entry ... F1452.3&pageseq 87 75, Vol 3 ref Few of Darwin s colleagues shared his enthusiasm for pangenesis. ref ... XXVII on Pangenesis. The book never became popular and sold only 5000 copies in Darwin s lifetime ... . citation last Stanford first P. Kyle year 2006 title Darwin s pangenesis and the problem of unconceived ... more details
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- Hugo de Vries
, De Vries published his book Intracellular Pangenesis , ref http www.esp.org books devries pangenesis facsimile ref in which, based on a modified version of Charles Darwin s theory of Pangenesis of 1868 ... known works are http www.esp.org books devries pangenesis facsimile Intracellular Pangenesis 1889 ... more details
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- Inheritance of acquired characteristics
his own theory of inheritance of acquired characters, pangenesis . The basic concept of inheritance ... link used to go to Sheldrake s stuff, since moved. I think this link is not worth keeping? Pangenesis ... more details
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- History of genetics
was similar to Darwin s later ideas on pangenesis , involving heredity material that collects ... seemed to be required. Darwin s own theory of heredity, pangenesis , did not meet with any large degree of acceptance. A more mathematical version of pangenesis, one which dropped much of Darwin s Lamarckian ... Vries, H. de 1889 Intracellular Pangenesis http www.esp.org books devries pangenesis facsimile pan ... more details
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- Blending inheritance
, tienne Geoffroy Saint Hilaire Geoffroyism , Pangenesis . It took the experiments of Gregor Mendel ... in 1868, called pangenesis . Not least of all, his objections likely arose because it conflicted ... more details
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- Weismann barrier
BF00347587 ref See also Epigenetic inheritance Baldwin effect Pangenesis References reflist External ... more details
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- Lamarckism
hypothesis Pangenesis , and explained it in the final chapter of his book Variation in Plants ... to be the inheritance of acquired characteristics. Pangenesis, which he emphasised was a hypothesis ... declared that he had disproved Darwin s hypothesis of Pangenesis, but Darwin objected, in a letter ... in his writings. He pointed out that he regarded Pangenesis as occurring in Protozoa and plants ... F1751&pageseq 1 title Pangenesis accessdate 2007 11 08 author Charles Darwin authorlink Charles Darwin ... of this idea is that it strongly resembles Darwin s own theory of pangenesis, except in the soma ... more details
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- Neo-Darwinism
Neo Darwinism is the Modern evolutionary synthesis modern synthesis of Charles Darwin Darwinian evolution through natural selection with Mendelian genetics , the latter being a set of primary tenets specifying that evolution involves the transmission of characteristics from parent to child through the mechanism of Genetics genetic transfer, rather than the blending process of pre Mendelian evolutionary science. Neo Darwinism also separates Darwin s ideas of natural selection from his hypothesis of Pangenesis as a Lamarckism Lamarckian source of variation involving blending inheritance. ref name Kutschera cite journal author Kutschera U, Niklas KJ title The modern theory of biological evolution an expanded synthesis journal Naturwissenschaften volume 91 issue 6 pages 255 76 year 2004 pmid 15241603 doi 10.1007 s00114 004 0515 y ref As part of the disagreement about whether natural selection alone was sufficient to explain speciation , George Romanes coined the term neo Darwinism to refer to the version of evolution advocated by Alfred Russel Wallace and August Weismann with its heavy dependence on natural selection. ref name Gould216 Gould The Structure of Evolutionary Theory p. 216 ref Weismann and Wallace rejected the Lamarckian idea of inheritance of acquired characteristics, something that Darwin had not ruled out. ref http www.springerlink.com content f6131358k265g3u4 Kutschera U. 2003. A comparative analysis of the Darwin Wallace papers and the development of the concept of natural selection. Theory in Biosciences 122 , 343 359 ref The term was first used in 1895 to explain that evolution occurs solely through natural selection , in other words, without any mechanism involving the inheritance of acquired characteristics resulting from use or disuse. ref name Reif cite journal author Reif W E. Junker T. Ho feld U. title The synthetic theory of evolution general problems and the German contribution to the synthesis journal Theory in Biosciences volume 119 issue 1 ... more details
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- Wilhelm Johannsen
that stemmed from Charles Darwin Darwin s theory of pangenesis . The book became one of the founding ... more details
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- 1868 in science
Year nav topic 1868 science The year 1868 in science and technology involved some significant events, listed below. Biology January 30 Publication of Charles Darwin s The Variation of Animals and Plants under Domestication by John Murray publisher John Murray in London , including his theory of heredity , which he calls pangenesis . Jules Emile Planchon and colleagues propose Phylloxera as the cause of the Great French Wine Blight . ref cite journal url http www.wampumkeeper.com wineblight.html title The Great French Wine Blight journal Wine Tidings volume 96 month July August year 1986 accessdate 2011 08 01 archiveurl http web.archive.org web 20110717235415 http www.wampumkeeper.com wineblight.html archivedate 17 July 2011 DASHBot deadurl yes ref Roland Trimen reads a paper to the Linnaean Society explaining Batesian mimicry in Africa n Butterfly butterflies . ref Published in Transactions 26 3 1870 497. ref ref cite journal title Roland Trimen, 1840 1916 jstor 80995 journal Proceedings of the Royal Society of London , Series B, Containing Papers of a Biological Character volume 91 issue 641 year 1920 pages xviii xxvii ref Thomas Henry Huxley T. H. Huxley discovers what he thinks is primordial matter and names it Bathybius haeckelii . He admits his mistake in 1871. ref cite book last Ley first Willy authorlink Willy Ley year 1959 title Exotic Zoology book Exotic Zoology location New York publisher Viking Press ref The Granny Smith apple cultivar originates in Eastwood, New South Wales , Australia , from a chance seedling Fruit tree propagation propagated by Maria Ann Smith n e Sherwood, 1799&ndash 1870 . ref cite web url http adb.anu.edu.au biography smith maria ann 13199 first Megan last Martin title Smith, Maria Ann 1799 1870 work Australian Dictionary of Biography publisher National Centre of Biography, Australian National University location Canberra year 2005 accessdate 2012 01 27 ref Chemistry August 18 The element later named as helium is first detected in t ... more details
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- Baldwin effect
Evolvability Genetic assimilation James Mark Baldwin Lamarckism Pangenesis Phenotypic plasticity ... more details
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- Gene
of inheritance was expressed in 1883 by Wilhelm Roux . Darwin also coined the word pangenesis ... The word pangenesis is made from the Greek language Greek words pan a prefix meaning whole , encompassing ..., in his book Intracellular Pangenesis although probably unaware of Mendel s work at the time, he coined ... . ref name pangen Vries, H. de 1889 Intracellular Pangenesis http www.esp.org books devries pangenesis ... more details
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- Edward J. Steele
of pangenesis, except in the soma to germ line feedback theory, pangenes are replaced with realistic ... more details
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- Clémence Royer
but added an additional preface in which she directly criticised Darwin s idea of pangenesis introduced ... preface abusing me like a pick pocket for pangenesis which of course has no relation to Origin . Her ... more details
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- Paradigm shift
of Mendelian inheritance , as opposed to pangenesis in the early 20th century Examples ... more details
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- James Mark Baldwin
also George Herbert Mead Life history theory Orthogenesis Epigenetics Pangenesis Weismann Barrier Evolutionary ... more details
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- William Bateson
concept already in 1889 and etymologically the word genetics finds its origin in Darwin s concept of pangenesis ... more details
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- Darwin from Orchids to Variation
Variation Under Domestication . Pangenesis He now tackled the chapter of Variation setting out his hypothesis about heredity, that pangenesis brought gemmules from every cell of the body to the reproductive ... hence will find Pangenesis and say, See this wonderful anticipation of our modern theories, and that stupid ... more details
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- Darwinism
Darwinism Social Darwinism Darwin Awards Pangenesis Charles Darwin s hypothetical mechanism for heredity ... more details
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- Gregor Mendel
a theory of pangenesis . It was not until the early 20th century that the importance of Mendel s ideas ... more details
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- Will to power
lamarckian or pangenesis pangenetic model of inheritance, the theory had plausibility at the time ... more details
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