| 释义 |
acentric, a.|əˈsɛntrɪk, eɪ-|
1. Geom. [f. Gr. ἄκεντρ-ος without centre + -ic.] Destitute of a centre.
1852Gregory Solid Geom. (ed. 2) 77 Acentric Surfaces: the general equation to these may be put in the form..
2. Biol. [f. a- 14 + -centric.] Of a chromosome: having no centromere. Also as n.
1937C. D. Darlington in Nature 30 Oct. 760/2 When the bivalent..attempts to divide, the ‘dicentric’ chromatid forms a bridge between the daughter nuclei, and the ‘acentric’ one incapable of movement, is lost. 1939Sturtevant & Beadle Introd. Genetics (1940) viii. 128 Acentric and dicentric chromosomes or chromosome fragments are not usually transmitted from one cell generation to another with any regularity. 1949Darlington & Mather Elem. Genetics vi. 131 Any single crossing-over within this loop gives two new chromatids, one with two centromeres attached to it, a dicentric, the other with none, an acentric. |