Genetical Studies on Oenothera

Genetical Studies on Oenothera

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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. 1911 edition. Excerpt: ...progeny of the F, hybrid plants 10.30La and 10.30Lb there was clear evidence of an advance in the size of the flowers which carried them in many plants beyond the size of the grandiflora parent and as far as the larger-flowered forms of Lamarckiana. The petals of these F, hybrid plants measured about 2.2 cm.; those of the largest of the F2 flowers measured 4.5 cm.; grandiflora B has petals about 3.3 cm. long and those of the largest-flowered forms of Lamarckiana measure about 4.5 cm. There was a similar advance in the size of the leaf and the extent of its crinkling, although the leaves did not reach the conditions characteristic of Lamarckiana. This is clearly progressive evolution and doubtless can be maintained through selection, though there may be in later generations constant retrogressive variation. This demonstration of a progressive advance in flower measurements in the F2 generation disarms those critics (as Gates, '11) who in prematurely discussing my F, hybrid plants 10.30La and 10.30Lb apparently failed to appreciate the basic principle that the characteristics of an F, hybrid are shown by what it will do in the F2 generation and not by what it may seem to be. N o experimenter in touch with present-day genetics would hope to get a perfect Lamarckiana type in the F, generation from a cross between biennis and grandiflora, for the reason that the characters of these species could neither blend nor appear as dominant or recessive in such a manner as to give this type. But with a proper selection of parent biotypes there is good reason to be hopeful that from the F2 generation of such a cross forms will appear with characters so shifted and modified as to match very closely those of Lamarckiana. My hypothesis does not of...show more

Product details

  • Paperback | 52 pages
  • 189 x 246 x 3mm | 109g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 1236837460
  • 9781236837462