| 释义 |
tetraploid, a. (and n.) Biol.|ˈtɛtrəplɔɪd|
[f. tetra- + -ploid.]
(Made up of somatic cells) containing the diploid chromosome complement twice over. Also as n., a tetraploid organism.
1914Proc. R. Soc. B. LXXXVII. 484 In the tetraploid giants the chromosomes are 2x(24) in the gametic and..4x(48) in the somatic cells. 1921Amer. Naturalist LV. 261 Few-noded tetraploids, however, are less easily distinguished. 1932[see quadruplex a. 3]. 1952New Biol. XIII. 38 It is necessary, before tetraploid rye can be introduced for general cultivation, to see that no normal rye is grown in the locality where the tetraploid is to be grown. 1974E. Stacey Peace Country Heritage ii. 90 Clover..breeders also have concentrated some of the better features, such as leaf retention and plant vigor, into ‘tetraploids’ by doubling the usual number of chromosomes. 1982Sci. Amer. May 118/3 Potato plants are tetraploid.
Hence ˈtetraploidy, the state of being tetraploid.
1918Babcock & Clausen Genetics xiv. 263 The doubling of the number of chromosomes typical of the species is known as tetraploidy. 1941Amer. Naturalist LXXV. 321 In many ornamental plants there is a definite need for new types with larger flowers, later blooming habit, and other characteristics usually associated with tetraploidy. 1970Sci. Jrnl. June 78/3 In lower animal forms both triploidy and tetraploidy are compatible with normal development. |