| 释义 |
allopolyploidy Biol.|ˌæləʊˈpɒlɪplɔɪdɪ|
[ad. G. allopolyploidie (Kihara and Ono 1927, in Zeitschr. für Zell. und Mikr. Anat. IV. 480), f. allo- 2 + polyploidy.]
The state or occurrence of a polyploid having its sets of chromosomes derived from different species by means of hybridization.
1928Darlington in Jrnl. Genetics XIX. 243 A useful distinction has been made amongst polyploids..according as their gametic complements are constituted by the reduplication of similar series (auto-polyploidy), that is, by the doubling of the chromosome number in a theoretically pure line, or by the combination of dissimilar series (allopolyploidy), that is, by doubling in a hybrid. 1930E. Müntzing in Hereditas XIII. 293 As to the nature of the chromosome increase the case may be one of auto-polyploidy (doubling of the same genome) or allo-polyploidy (addition of different genomes). 1952New Biol. XIII. 46 Among the newer crops which have arisen by allopolyploidy in recent years, the most notable are the various berries related to blackberry and raspberry of the genus Rubus.
Hence ˌalloˈpolyploid, a polyploid of this type. Also as adj.
1928Darlington in Jrnl. Genetics XIX. 243 It is impossible to draw any but an arbitrary line across the innumerable gradations between a pure type, as pure as inbreeding can produce, and a hybrid;..it is thus impossible to distinguish in absolute terms between an allo-polyploid and an auto-polyploid. 1938E. B. Ford Study Heredity iv. 95 The polyploids..belong to the group called autopolyploids, in which all the sets of chromosomes are derived from the same species. More striking..are the allopolyploids, which result from chromosome doubling after hybridization. 1953Rep. 13th Internat. Hort. Congress 1952 66 Allopolyploid or amphidiploid groups [of plants]..should be treated as species. |