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The Law of Heredity; A Study of the Cause of Variation, and the Origin of Living Organisms

The Law of Heredity; A Study of the Cause of Variation, and the Origin of Living Organisms


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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 III. HISTORY OF THE THEORY OF HEREDITY?(Continued). Some form of the evolution hypothesis a logical necessity? Darwin's pangenesis hypothesis?This is an evolution hypothesis, since all the characteristics of the adult are supposed to be latent in the germ?Miscellaneous objections to it?These objections do not show that it conflicts witli fact?Difficulty in imagining detailed working is no reason for rejecting it ?Gallon's experimental disproof?There are many reasons for believing that the sexual elements have different functions ?The evidence from parthenogenesis?Polar-cell hypothesis ?The evidence from hybrids, from variation, and from structures confined to one sex?The pangenesis hypothesis recognizes no such difference in the functions of the reproductive elements?We must therefore distrust its absolute correctness ?Summary of last two chapters. Some Form of the Evolution Hypothesis a Logical Necessity. Most of the hypotheses which have heen proposed, of late years, to account for the phenomena of heredity, are like the two we have quoted, epigenesis hypothesis, for they are attempts to show that the ovum is in reality, as well as in form, an unspecialized cell. Analysis shows, however, that they all rest ultimately upon the assumption that this is not true, but that the ovum really contains, in some form or other, actually or potentially, the future organism, with all its hereditary characteristics. We know that eggs which are to all appearances essentially alike, may, when artificially removed from the ovaries and artificially fertilized, and when kept under exactly the same conditions, develop into widely different organisms, and as like things cannot, under like conditions, give rise to different results, we are forced to conclude that these eggs are ...


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Product Details
  • ISBN-13: 9780217800020
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 92
  • Spine Width: 5 mm
  • Width: 189 mm
  • ISBN-10: 0217800025
  • Publisher Date: 09 Jul 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 181 gr


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