It is said that "necessity is the mother of invention". To be sure, wheels and pulleys were invented out of necessity by the tenacious minds of upright citi zens. Looking at the history of mankind, however, one has to add that "Ieisure is the mother of cultural improvement". Man's creative genius flourished only when his mind, freed from the worry of daily toils, was permitted to entertain apparently useless thoughts. In the same manner, one might say with regard to evolution that "natural selection mere(y tnodifted, while redundanry created". Natural selection has been extremely effective in policing alleHe mutations which arise in already existing gene loci. Because of natural selection, organisms have been able to adapt to changing environments, and by adaptive radiation many new species were created from a common ancestral form. Y et, being an effective policeman, natural selection is extremely conservative by nature. Had evolution been entirely dependent upon natural selection, from a bacterium only numerous forms of bacteria would have emerged. The creation of metazoans, vertebrates and finally mammals from unicellular organisms would have been quite impos sible, for such big leaps in evolution required the creation of new gene loci with previously nonexistent functions. Only the cistron which became redun dant was able to escape from the relentless pressure of natural selection, and by escaping, it accumulated formerly forbidden mutations to emerge as a new gene locus.
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Book Description Heidelberg, London, Springer Verlag / George Allen & Unwin Ltd., 1970. Cloth with dustjacket.. 160 S., with figures and tables. 25 cm. Guter Zustand / good condition. Cover and some pages soiled. dustjacket shows worn. Sprache: Englisch Gewicht in Gramm: 628. Bookseller Inventory # 556132
Book Description Springer-Verlag, BerlinNew York, 1970. hardcover. Book Condition: Good. 1St Edition. N/A. Ships from Reno, NV. Former Library book. Shows some signs of wear, and may have some markings on the inside. Bookseller Inventory # GRP93395070
Book Description Springer-Verlag, 1970. 160 leichte Gebrauchsspuren am Leineneinband, nach dem Vorwort eine Doppelseite mit lechten Flecken, insgesamt gut, 4k 4k //Rechnung mit ausgewiesener MwSt. liegt bei.// Sprache: Englisch Gewicht in Gramm: 711 23,2 x 16,7 x 2,8 cm, Gebundene Ausgabe, Ln. Bookseller Inventory # 18090