Some Results in Size Inheritance Volume 275-287

Some Results in Size Inheritance Volume 275-287

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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1915 edition. Excerpt: ...not conform to type in size, shape, or even color of fruit. If we then wish to assume that our results are due to multiple factors, and that our parents are heterozygous for many size factors, we must at the outset admit that the heterozygosity is permanent in an inbred line. We are then forced to assume another factor for each added "multiple" factor which keeps that multiple factor inactive. That means we must assume that for each character studied each type is homozyous for a certain size factor whichit exhibits, either homozygous or heterozygous for at least one other size factor which it does not exhibit, and homozygous for an inhibitor factor for each separate additional size factor. We inust further admit that there are no loose, uninhibited additional size factors, so that all the various sized factors and their respective inhibitors happen to be exactly paired in every type. For example, if a type w_ith the evident size factor "2o" for fruit length carried another size factor "25," either dominant or recessive to "20," that size factor "25" must always be paired with an inhibitor factor for "25," as otherwise the "25" would show in pure line cultures. Likewise we must assume that in the type an inhibited size factor does not influence the size fixed by the single uninhibited size factor. Since that must be true in every type, where in the total a large ntunber of size factors of all kinds must be involved, it follows that the presence of inhibited size factors does not affect size. The F1 of any cross carries the uninhibited and inhibited size factors with the respective inhibitors of the latter. Since these inhibited factors do not affect size more

Product details

  • Paperback | 26 pages
  • 189 x 246 x 1mm | 68g
  • United States
  • English
  • black & white illustrations
  • 123696246X
  • 9781236962461