| 单词 |
pangenesis |
| 释义 |
pangenesis Biol.|pænˈdʒɛnɪsɪs|
[f. Gr. παν-, pan- all + γένεσις birth: see -genesis.]
The name given by Darwin to his hypothesis, advanced to explain the phenomena of heredity, that every separate unit or cell of an organism reproduces itself by contributing its share to the germ or bud of the future off-spring. See quot. 1868.
1868Darwin Anim. & Pl. II. 359, I venture to advance the hypothesis of Pangenesis, which implies that the whole organization, in the sense of every separate atom or unit, reproduces itself. Hence ovules and pollen-grains—the fertilized seed or egg, as well as buds—include or consist of a multitude of germs thrown off from each separate atom of the organism. 1869F. Galton Hered. Genius 363. 1870 Tyndall Sci. Use Imag. in Lect. & Ess. (1903) 72/2 He [Mr. Darwin] has drawn heavily upon time in his development of species, and he has drawn adventurously upon matter in his theory of pangenesis. According to this theory, a germ, already microscopic, is a world of minor germs. 1877Huxley Anat. Inv. Anim. i. 40. 1892 J. A. Thomson Outlines Zool. 65 This hypothesis has been repeatedly modified, but, except in the general sense that the body may influence its reproductive cells, ‘pangenesis’ is discredited by most biologists.
b. intracellular pangenesis: see quot.
1900Gould Dict. Med. Biol., Intracellular Pangenesis, the origin of ultimate vital principles (pangenes, gemmules, biophors) within the cell. |
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