1.1Genetics (of a chromosome) having no centromere.
‘However, not all acentric chromosomes and dicentric chromosomes/centric rings were converted to MNi and NPB respectively, depending on the dose of radiation.’
‘This classification method uses anti-kinetochore antibody staining to identify the presence of kinetochore protein associated with the centromeres of chromosomes or its absence from acentric chromosome fragments.’
‘Also excluded are exchanges that would generate dicentric or acentric chromosomes, such as exchanges that may occur between rDNA subunits lying in opposite orientation.’
‘Further, the products of crossovers between inverted repeats may lead to dicentric and acentric chromosomes that often cannot be transmitted to the next generation.’
‘In metaphase, chromatid fragments are attached to the homologous area of the sister chromatid while acentric chromosome fragments are apart from their chromosome of origin.’
‘Six structurally acentric chromosomes were generated from the irradiation of Dp 238, supporting the findings of a previous study.’
‘The analysis of structural aberrations included chromatid and chromosome breaks, appearance of acentric fragments, dicentric chromosomes and chromatid exchanges (tetraradius forms).’
‘Micronuclei may originate from an acentric chromosome fragment or whole chromosomes lost from the metaphase plate and provide therefore a measure of both chromosome breakage and chromosome loss.’
‘This paper describes an analysis of the frequency of dicentric chromosomes and acentric fragments in 1260 subjects occupationally exposed to X-rays and 241 controls.’
‘A dicentric chromosome plus an acentric fragment were scored as one single aberration.’
‘Micronuclei are acentric chromosome fragments or whole chromosomes that are left behind during mitotic cellular division and appear in the cytoplasm of interphasic cells as small additional nuclei.’
‘Micronuclei may originate from acentric chromosome fragments or whole chromosomes lagging behind during cell division.’
‘They are formed by acentric chromosome fragments or whole chromosomes which are not incorporated into daughter nuclei during cell division.’
‘Ectopic crossing over causes chromosomal abnormalities, including deletions, translocations, and acentric and dicentric chromosomes.’
‘Micronuclei can arise from acentric chromosome fragments or whole chromosomes that have not been incorporated in the main nuclei at cell division.’
‘The first numeral refers to the chromosome providing the centromere-carrying segment, the second to the chromosome supplying the acentric segment.’
‘These data further support the idea that the observed micronuclei result from preferential exclusion of acentric DNA fragments.’
‘Dicentrics, rings, acentric fragments and asymmetrical translocations were recorded separately.’
‘Other aberrations, such as minutes, acentric rings, dicentrics and exchanges, were rarely seen.’
Are You Learning English? Here Are Our Top English Tips