| 释义 |
allotetraploid, a. and n. Biol.|ˌæləʊˈtɛtrəplɔɪd|
[f. allo- 2 + tetraploid.]
= amphidiploid a. and n.
1930W. J. C. Lawrence in Genetica XII. 272 Hybrid tetraploid (allo-tetraploid). Ibid. 277 The most probable origin of an allotetraploid would seem to be hybridisation of two self-incompatible diploid species. 1938E. B. Ford Study Heredity x. 225 The allotetraploids..may be quite fertile forms, though sterile with the two species from which they are derived. Ibid. 239 An allotetraploid plant is as completely isolated from its parent species as if it had been transported to a desert island. 1957M. Abercrombie et al. Dict. Biol. 14 Allotetraploid (amphidiploid), allopolyploid which arises when an ordinary hybrid between two different species, containing a set of chromosomes from each parent, doubles its chromosome number. An ordinary hybrid is usually sterile because its chromosomes cannot pair during meiosis. But if it becomes an allotetraploid it solves this difficulty because each chromosome then has a homologue with which it can pair... Artificial preparation of allotetraploids has great scope in the production of new agricultural and horticultural varieties.
Hence alloˈtetraploidy, the state or occurrence of such a tetraploid.
1942J. S. Huxley Evolution iii. 87 Allotetraploidy is almost confined to plants, because of the favourable conditions provided by their vegetative growth for the rare chromosome-doubling. |