| 词汇 | tetrad |
| 释义 | tetrad noun[ C ] uk /ˈtet.ræd/ us /ˈtet.ræd/ a group of four cells produced during cell division四分染色体 Cells actin anaphase anti-platelet assort axoplasm histochemistry histography homologous chromosomes infiltration intercellular neoplasia nerve fibre neurofibril neurofibrillary neuroglia teratoma thrombocyte thymocyte turgor unciliated tetrad | American Dictionarytetrad noun[ C ] us/ˈte·træd/ biology a group of four cells produced during cell division Examples of tetradtetrad The rest of the mutations were clearly generated during meiosis and occurred in tetrads with any progenitor alleles. For grey squirrels the expansion in tetrads occupied appeared to rise asymptotically, with the expansion declining after 1999. A subset of clones was verified more thoroughly by measuring under r40 magnification the sizes of the haploid colonies obtained after tetrad dissection. Red squirrels may have recolonized tetrads from which they were lost in the last 2 years of the sample period. There was no significant relationship between duration of overlap and the amount of conifer present in each tetrad. None of the models above provides an explanation for the duplications seen in tetrads nos. 26 and 28. We then estimated the effectiveness of control by predicting the number of tetrads in which red squirrel populations survived in 2003. The other three spores in these tetrads were non-mutants. Two tetrads (nos. 31 and 32) had 3 alleles of large progenitor origin. Such a pattern would also be produced if two clones within one tetrad happened to be altered due to purely phenotypic and not genetic reasons. The number of tetrads in which both species were found increased from 1993 to 1997 and then decreased to a very low level by 2002. Here we present the first tetrad analysis of mutations at a human minisatellite locus. It was found that the large majority of mutant alleles generated during meiosis occurred as single mutants in one of the spores in a tetrad. It was also assumed that once a tetrad had been recorded as having grey squirrels present then they would be present in all subsequent years. Of 29 tetrads with mutants of meiotic origin, the majority (25) contained only one spore with a mutated allele. 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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