| 释义 |
▪ I. supergene, a. Min.|ˈs(j)uːpədʒiːn|
[f. super- 1 a: see -gen 3.]
Of an ore or mineral: enriched or deposited by a downward-moving solution; involving deposition by a downward-moving solution.
1914F. L. Ransome in Bull. U.S. Geol. Survey No. 540. 153 The suggestion is offered that minerals deposited by generally downward-moving and initially cold solutions may be termed supergene minerals. 1944[see paravauxite s.v. para-1 2 c]. 1977A. Hallam Planet Earth 112 Where leaching of sulfide ore deposits occurs, residual red and brown iron hydroxyoxide cappings (gossans) are left, and other elements can be carried down and precipitated in a zone of ‘supergene’ enrichment near the water table.
▪ II. ˈsupergene, n. Genetics.
[f. super- 6 c + gene1.]
A group of closely linked genes, freq. having related functions.
1949Darlington & Mather Elem. Genetics ii. 46 Thus the cross between male and female is a back-cross for the X–Y pair of chromosomes or, if you like, the X–Y super-gene, and half the offspring are of each sex. Ibid. v. 118 The differences could be interpreted as two gene differences so closely linked as never to recombine (two-gene system). Or one of them could be regarded as associated with an inversion inhibiting recombination (one super-gene system). 1978Nature 13 July 164/1 The t complex seems to provide an example of a ‘supergene’—a large chromosomal segment with multiple genes involved in similar, or closely related functions. |