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Alternating Generations; A Biological Study of Oak Galls and Gall Flies

Alternating Generations; A Biological Study of Oak Galls and Gall Flies


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About the Book

Purchase of this book includes free trial access to www.million-books.com where you can read more than a million books for free. This is an OCR edition with typos. Excerpt from book: CHAPTER VI. Alternating Generations In Oak Gall-flies. The RelationShip or The Parthenogenetic To The Sexual Generation. How 1s This Generation-cycle To Be Explained ? It only remains, in conclusion, to review generally the subject of alternation of generations in oak gall-flies, but I would premise that I have chosen the term ' alternating generations': without intending in any way to prejudge the question. It only indicates the possession of cyclical propagation; while the different terms used with regard to this form of propagation, such as alternating generation, heterogenesis, metagenesis, are, although all closely related, each used in a different sense. Lubbock requires, as a necessary condition of alternating generation, that one generation should propagate itself by budding, like Aphides; but with gall-flies propagation by budding does not take place. Although parthenogenesis and budding may not differ in principle, yet there is this important distinction between them, that in the former, embryonic development runs its entire course outside, and in the latter, inside the ovarium- Among gall-flies both generations develop in exactly the same manner. For this reason I cannot agree with 1 Generationswechsel. Lichtenstein, who so ably investigated the Phylloxera, in assuming that the agamous generation of gall-flies holds a subordinate position to the sexual generation, in the way that the budding generations of Phylloxera and Aphides do to their winged and sexual generations. The question of the mutual relationship of the two generations to each other, is of fundamental importance in the inquiry into the origin of alternation of generations. It is necessary therefore next to consider parthenogenesis, in so far as it has a bearing on alternation of generations. ...


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Product Details
  • ISBN-13: 9781459025981
  • Publisher: General Books
  • Publisher Imprint: General Books
  • Height: 246 mm
  • No of Pages: 68
  • Spine Width: 4 mm
  • Width: 189 mm
  • ISBN-10: 1459025989
  • Publisher Date: 03 Feb 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 141 gr


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