Why should the gene be suggested to be inconstant when the contrary view, that gene structure is invariant except through mutagenic processes induced by potent external factors, has long been a universal doctrine of genetics? Indeed, during the early part of the present century before mutation was recognized as being of general occurrence, the seeming unvarying nature of the gene led to skepticism regarding the validity of the evolutionary theory; only later could the origins of the morphological differences between individuals and species be attributed to a combination of mutation and evolution, involving natural forces selecting between favorable and unfavorable genetic changes. But during the past several decades, as knowledge of the macromolecular constitution of or- ganisms has increased to the point where even the primary structures of the genes themselves are being revealed on a routine basis, it has become increas- ingly difficult to ascribe all the resulting observations to ordinary mutagenesis and natural selection. Some more profound mechanism often seems to be present that influences both the constancy and inconstancy of the genes, an ap- paratus whose existence this study hopes to reveal. In seeking to demonstrate the universality of this mechanism, data are sought through the numerous activities of organisms of many types wherever gene action changes are manifest.
Les informations fournies dans la section « Synopsis » peuvent faire référence à une autre édition de ce titre.
Vendeur : Liberty Book Shop, Avis, PA, Etats-Unis
Hardcover. Etat : Very Good+. Etat de la jaquette : Very Good+. 1st ed. In DJ. X-library w/internal & external marks Prepared for library, but never circulated. ; HB, sm 4to; 581 pages. N° de réf. du vendeur 34432
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Vendeur : Plurabelle Books Ltd, Cambridge, Royaume-Uni
Hardcover. Etat : Very Good. viii 581p hardback first edition, blue cloth with green jacket, very good condition, light wear to jacket edges, pages lightly tanned along edges but otherwise like new, diagrams and photos very sharp and clear, binding strong, an excellent used copy of an uncommon title Language: English. N° de réf. du vendeur 200359
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Vendeur : Le-Livre, SABLONS, France
Couverture rigide. Etat : bon. RO40140743: 1983. In-8. Relié. Bon état, Couv. convenable, Dos satisfaisant, Intérieur frais. 581 pages. Illustré de nombreux dessins et photos en noir et blanc dans et hors texte. Jaquette légèrement passée. Avec Jaquette. . . Classification Dewey : 420-Langue anglaise. Anglo-saxon. N° de réf. du vendeur RO40140743
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