| 单词 | sex chromatin |
| 释义 | > as lemmassex chromatin sex chromatin n. Biology (originally) the material of the sex chromosomes; the part of the chromatin of a cell which acts as a sex determinant; (later) spec. the material comprising a small heterochromatic mass (the Barr body, believed to be an inactivated X chromosome), of which there is one in a normal (XX) female cell and in general one less than the number of X (or Z) chromosomes in a cell. ΘΚΠ the world > life > biology > biological processes > genetic activity > genetic components > [noun] > chromatin chromatin1882 oxychromatin1894 basichromatin1902 trophochromatin1905 sex chromatin1909 heterochromatin1932 1909 G. N. Calkins Protozoöl. 257 A statement which, if true, gives..confirmation of the early hypothesis of Balfour and Minot that the nucleus of the primordial egg or sperm cell contains both kinds of sex chromatin, the opposite kind being eliminated by the reducing divisions of each sex. 1952 Graham & Barr in Anat. Rec. 112 709 The term ‘sex influenced chromatin’, or simply ‘sex chromatin’, will be used in the description to follow for the nuclear structure characterized by a size relation to sex. 1962 Lancet 27 Jan. 216/2 In all cases the sex-chromatin pattern was shown to be consistent with the morphological sex. 1994 D. Tulchinsky & A. B. Little Maternal–Fetal Endocrinol. (ed. 2) xv. 300/2 The inactive X chromosome is attached to the inner surface of the nuclear envelope as a heterochromatic body, also known as the Barr body or sex chromatin body. < as lemmas |
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