| 释义 |
isopycnosis Cytology.|ˌaɪsəʊpɪkˈnəʊsɪs|
Also -pyknosis.
[f. iso + heteropycnosis.]
The character or condition of having such a degree of condensation and staining as is typical of the majority of chromosomes or chromosomal regions within a particular nucleus. Hence ˌisopycˈnotic a.
1950G. Östergren in Hereditas XXXVI. 511 Heteropycnosis is a term in current use in chromosome studies... It might be useful to have a term for the opposite effect to that called heteropycnosis. Since such a term might actually have a function to fulfil, I suggest that the term isopycnosis be introduced. Ibid. 512 That a chromosome region is isopycnotic should then mean simply that it does not differ from the majority of the chromosome regions of the cell in its appearance. 1962Lancet 29 Dec. 1384/1 In female meiosis the two X chromosomes may show complete or partial isopyknosis according to the type of pairing. 1967U. Mittwoch Sex Chromosomes xii. 242 Both X-chromosomes of the female become isopycnotic [during gametogenesis]. |