| 词汇 | chromatid |
| 释义 | chromatid noun[ C ] biology specializeduk /ˈkrəʊmətɪd/ us /ˈkroʊmətɪd/ either of the parts into which a chromosome divides during mitosis (= when one cell divides into two identical cells)染色单体 Cells actin anaphase anti-platelet assort axoplasm histography homologous chromosomes infiltration intercellular intermitotic nerve fibre neurofibril neurofibrillary neuroglia neuroglial tetrad thrombocyte thymocyte turgor unciliated Examples of chromatidchromatid We consider this unsuccessful development of reconstituted eggs to be due mainly to abnormal spindle formation and/or unequal distribution of chromatids, as described above. One of the spores carries a mutant allele with a structure showing that a duplication in one chromatid had been transferred to a homologous chromatid. Chromatids carrying the smaller allele are represented in black, and chromatids carrying the larger allele are represented in grey. There were no differences in the distribution of the different types of chromosomal and chromatid aberrations between the two storage groups. Two molecular processes generating variability have been proposed : replication slippage due to slipped-strand mispairing and unequal recombination between homologous chromosomes (or chromatids). Separate chromatids can also be resolved in the long arms of these chromosomes (arrowheads). In each cell analysed, the number of chromosomes and/or chromatids was counted at x1250 magnification to provide data for calculating aneuploidy. Fourteen hyperhaploidies were found, seven involving additional single chromatids. In the diagram one chromatid has segregated with the whole chromosome and the other is alone. There were seven examples of extra chromatids and four of missing ones, in ten oocytes. The somatic chromosomes consist of two sister chromatids. An oocyte classified as 201/2 contains 20 dyads and one chromatid or one-half dyad. The first requirement is for close pairing of homologous chromosomes, followed by recombination between non-sister chromatids. In addition, no allele has been found in which the exchange point between homologous chromatids was included in a duplication. Differential inhibition of sister chromatid condensation induced by 5-azadeoxycytidine in human chromosomes. These examples are from corpora and from sources on the web. Any opinions in the examples do not represent the opinion of the Cambridge Dictionary editors or of Cambridge University Press or its licensors. |
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