A History of Science(of 5) Aspects of Recent Science Volume 5
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A History of Science(of 5) Aspects of Recent Science Volume 5

A History of Science(of 5) Aspects of Recent Science Volume 5


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About the Book

Excerpt: ...beings in classes according to this very fundamental quality of the cells he would have some very curious relations established. Thus, under the heading "creatures whose cells have twenty-four chromosomes," one would find beings so different as "the mouse, the salamander, the trout, and the lily," while the sixteen-chromosome group would introduce the very startling association of the ox, the guinea-pig, the onion, and man himself. But whatever their number, the chromosomes are always exactly bisected before the cell divides, one-half being apportioned to each of the two cells resulting from the division. Now the application is this: It was the study of these odd nuclear structures and their peculiar manouvrings that, in large measure, led Professor Weismann to his well-known theory of heredity, according to which the acquired traits of any being are not transmissible to the offspring. Professor Weismann came to believe that the apportionment of the nuclear substance, though quantitatively impartial, is sometimes radically uneven in quality; in particular, that the first bisection of the egg-cell, which marks the beginning of embryonic development, produces two cells utterly different in potentiality, the one containing the "body plasm," which is to develop the main animal structures, the other encompassing the "germ plasm," by which the racial integrity is to be preserved. Throughout the life of the individual, he believed, this isolation continued; hence the assumed lack of influence of acquired bodily traits upon the germ plasm and its engendered offspring. Hence, also, the application of the microscopical discovery to the deepest questions of human social evolution. Every one will recall that this theory, born of the laboratory, made a tremendous commotion in the outside world. Its application to the welfare and progress of humanity gave it supreme interest, and polemics unnumbered were launched in its favor and in its condemnation. Eager...


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Product Details
  • ISBN-13: 9781153826822
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 76
  • Spine Width: 4 mm
  • Width: 189 mm
  • ISBN-10: 1153826828
  • Publisher Date: 01 Aug 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 154 gr


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