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Contributions from the Zoological Laboratory Volume 21

Contributions from the Zoological Laboratory Volume 21


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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1920 Excerpt: ...of the individuality of chromosomes and is now so well supported by many observations that it may be said to be a part of the creed of modern biology. Indeed our knowledge has reached the point where numerical variations are not considered as prima facia evidence against the theory, but as another manifestation of an imperfectly understood organization. The following report deals with the chromosomes in the somatic cells of the evening primrose, CEnothera scintillans, de Vries, and of the pig, Sus scrofa, in which the diploid chromosome number of the soma was found to be variable. The bearing of these facts upon the individuality theory is indicated. The Cytological Conditions In CEnothera scintillans. The somatic, or diploid, number of chromosomes in CEnothera scintillans is fifteen. In material collected from three generations of these plants variations of this number have been found to range from fifteen to twenty-one. This diversity in number is not due to additions to the chromosome complex but to the fragmentation of certain individuals. From a preliminary study of the root tips of a fourth generation of 0. scintillans I am inclined to believe that here the increase in chromosome number is not as great as just indicated. Breaks or clear areas occur in certain chromosomes which make what may be a single chromosome, appear as two. In my earlier material the possible relationship of chromosome portions on either side of the clear space was not so obvious as in the latest specimens. The last root tips collected present these portions in such perfect alignment as to suggest that they are a part of a common body. The clear areas are variable in extent and in certain cases one portion of the chromosome may be turned at right angles to the other. In a few ins...


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Product Details
  • ISBN-13: 9781130821123
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 182
  • Spine Width: 10 mm
  • Width: 189 mm
  • ISBN-10: 1130821129
  • Publisher Date: 01 Mar 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 336 gr


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