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The Third and Fourth Generation; An Introduction to Heredity

The Third and Fourth Generation; An Introduction to Heredity


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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. 1918 Excerpt: ...ancestry is diagrammed were derived one from a great-grandmother, one from a great-grandfather, and they might in a similar way be traced back much farther. If now a given chromosome contains a set of determiners for particular characters we can readily see why this individual bears striking resemblance to two of its great-grandparents. This, of course, is a crude illustration of the sort of thing that inheres in the notion of the individuality of the chromosomes. It must not be taken for granted that all of this has been proven; it is merely a working hypothesis rendered probable by recent investigations and the experience of breeders. The first successful attempt to connect specific characters with particular chromosomes came with the discovery that in certain insects there is one chromosome in the male called the odd or;e-chromosome which does not pair with a fellow preparatory to the reduction division at the time the sperm are formed. It goes entire to one or the other of the sperm so that these are of two sorts, one with the odd chromosome, one without it. It was Henking who made this discovery in 1899 in a locust or grasshopper, Phyrocorrus; it was soon confirmed by other investigators working on other animals. McClung, the same year, suggested that this odd chromosome is a sex-determiner. If an egg is fertilized by a sperm that contains the odd chromosome, the fertilized egg develops into a female, but if fertilized by a sperm of the other type it develops into a male. Thus in the white man there are forty-seven chromosomes in the male, but forty-eight in the body cells of the female. Evidently the chromosome which is an odd one in the male finds a mate in the cells of the female since the chromosome number is even. The female may be said to have a ...


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Product Details
  • ISBN-13: 9780217064484
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 28
  • Spine Width: 2 mm
  • Width: 189 mm
  • ISBN-10: 0217064485
  • Publisher Date: 01 May 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 68 gr


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