| 释义 |
heterochromatization Cytol.|ˌhɛtərəʊˌkrəʊmətaɪˈzeɪʃən|
Also ˌheteroˌchromatiniˈzation.
[f. prec. + -ization.]
A change of state of chromosome material in which it becomes heterochromatic and the action of the genes is modified or suppressed; also, the extent to which such a change has occurred. So ˌheteroˈchromat(in)ized ppl. a.
1941Cold Spring Harb. Symp. Quant. Biol. IX. 158/2 When extra heterochromatin..is added to a cell, the heterochromatization..is lessened. Ibid., The euchromatic regions which have been transferred into the vicinity of heterochromatic ones are themselves partly..‘heterochromatized’. 1944Amer. Naturalist LXXVIII. 207 Variable ‘heterochromatinization’ takes place not only in salivary gland cells but in other body cells as well. 1948Jrnl. Genetics XLVIII. 80 The process of heterochromatization (heteropycnosis) is reversible. Ibid. 83 The active section is sometimes so highly heterochromatized that it becomes quite indistinguishable from the neighbouring inert region. 1957C. P. Swanson Cytol. & Cytogenetics xiv. 469 This proposes that heterochromatin is formed from euchromatin by a process of genic degeneration... The end point of such an evolutionary trend..would be heterochromatinization of the entire Y. 1964Science 10 July 130/1 Tissue..in which the heterochromatized X is of paternal origin. 1969Nature 16 Aug. 683/2 The X chromosome that forms the sex-chromatin mass of normal females..is clearly heterochromatic when it forms (by facultative heterochromatization) a distinct chromocentre in the interphase nucleus. |