| 单词 |
triploid |
| 释义 |
triploid, n. and a.|ˈtrɪplɔɪd|
[ad. mod.L. triploides, f. Gr. τριπλό-ος: see prec. and -oid.]
A. n.
1. Surg. (See quot.) rare (? Obs.).
[1706Phillips (ed. Kersey), Triploides.] 1750Mem. R. Acad. Surg. Paris I. 162–3 The instruments hitherto used to raise the bones of the cranium depressed on the dura mater are..the triploid... This instrument has three feet or branches like a tripod.
2. A triploid organism (see below).
1927Jrnl. Genetics XVIII. 183 These five are all the configurations which have been seen among several hundred trivalents of triploids..in Datura and Canna. 1957R. A. Beatty Parthenogenesis & Polyploidy in Mammalian Devel. iv. 59 Three of the young [rabbits] lived nearly a year, being the two ‘triploids’ and a presumed diploid male. 1973[see octoploid a. (n.)].
B. adj. Genetics. [Cf. -ploid.] (Made up of somatic cells) containing three sets of chromosomes.
1911Ann. Bot. XXV. 933 There is not, so far as I am aware, a single case of a species whose sporophyte has the triploid number of chromosomes. 1930Times Lit. Suppl. 10 July 578/3 Triploid apples (e.g., Bramley's Seedling) fruit well. 1971[see diploid a.].
Hence ˈtriploidy, the state of being triploid.
1916Genetics I. 237 It seems probable that we have in these plants examples of triploidy (21 chromosomes). 1961Lancet 5 Aug. 318/1 A malformation syndrome associated with triploidy. 1976Cytogenetics & Cell Genetics XVII. 144 Triploidy or diploid/triploid chimerism has been reported in man. 1982Annals Human Genetics XLVI. 223 Human triploidy is a common condition. |
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