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Titlebook: Evolution by Gene Duplication; Susumu Ohno Book 1970 Springer Science+Business Media New York 1970 Evolution.adaptive Radiation.evolution.

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發(fā)表于 2025-3-21 16:22:28 | 只看該作者 |倒序瀏覽 |閱讀模式
書目名稱Evolution by Gene Duplication
編輯Susumu Ohno
視頻videohttp://file.papertrans.cn/318/317684/317684.mp4
圖書封面Titlebook: Evolution by Gene Duplication;  Susumu Ohno Book 1970 Springer Science+Business Media New York 1970 Evolution.adaptive Radiation.evolution.
描述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 b
出版日期Book 1970
關(guān)鍵詞Evolution; adaptive Radiation; evolution; genes
版次1
doihttps://doi.org/10.1007/978-3-642-86659-3
isbn_softcover978-3-642-86661-6
isbn_ebook978-3-642-86659-3
copyrightSpringer Science+Business Media New York 1970
The information of publication is updating

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Perpetuation of the Germ Linee to live 5 years. In the case of man, gradual deterioration which accompanies aging appears to begm at about 30; a 100-year-old man is as rare as a 2-year-old mouse. Yet, in a strict sense, only the somatic cells of the body are mortals.
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Replication of Nucleic Acids on the Basis of A-T, G-C Complementality and the Origin of Lifenherited trait perpetuates itself through many, many generations of individuals. The molecule which is a gene must have an inherent property, so that the exact replica of itself can be made before each cell division.
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Mutation as a Change in the Base Sequence of a DNA Cistronrty of being able to make an exact replica of itself before each cell division. Yet, if the mechanism of DNA replication were perfect and there was no room for mistakes, the creation of divergent living creatures from a common ancestor could not have happened.
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Tolerable Mutations because mutations affecting these parts of a molecule have efficiently been eliminated by natural selection. Nevertheless, when the amino acid sequence of homologous polypeptide chains from diverse species are compared, amino acid substitutions at a varying number of sites are noted. Those mutation
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The Attainment of a Permanent Heterozygous Advantage by the Incorporation of Two Former Alleles intoare incorporated into the genome as two separate gene loci. In this way, every member of a species would come to enjoy the heterozygous advantage without ever having to produce homozygotes which may be unfit.
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