August Weismann Signed Note, Evolutionary Biologist, Darwin, Germ-plasm Theory
"ONE OF THE GREAT BIOLOGIST OF ALL TIME" STUDIED HOW THE TRAITS OF ORGANISMS DEVELOPED AND EVOLVED AND PROPOSED THE THEORY OF CONTINUITY OF GERM-PLASM, A THEORY OF HERIDITY. Weismann, 23/3/06, Freiburg im Breisgau, on a card 5 x 2.75, by the German evolutionary biologis t who is considered the second most notable evolutionary theorist of the 19. Weismann became Director of the Zoological Institute and the first Professor of Zoology at Freiburg. His main contribution involved germ-plasm theory, according to which inheritance (in a multi-cellular organism) only takes place by means of the germ cells - the gametes such as egg cells and sperm cells. Other cells of the body - somatic cells - do not function as agents of heredity. The effect is one way: germ cells produce somatic cells and are not affected by anything the somatic cells learn or therefore the ability an individual acquires during its life. Genetic information cannot pass from soma to germ plasm and on to the next generation. Biologist refers to this concept as the Weismann barrier. This idea rules out the inheritance of acquired characteristics as proposed by Jean-Baptiste-Lamarck. His handwritten note in German, translated in full: If you want to judge my handwriting, then I must write precisely in German script using Latin characters, as only these come naturally to my hand. The card isin fine condition, with minor age toning. This item has been authenticated and is accompanied by a Certificate of Authenticity issued by our parent company, History Makers Autographs. We financially stand behind our COA.
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