centric fission

centric fission

the splitting of a chromosome at or near the CENTROMERE to produce two chromosomes.
References in periodicals archive ?
Robertsonian fusion and centric fission are unique in being readily identified in comparative karyotype studies since both result in concomitant changes in chromosome morphology and chromosome number.
Centric fission is the consequence of a break within the centromere of a single metacentric producing initially two structural telocentrics whose raw ends have the capacity to fuse after replication.
Alteration by centric fission of the diploid number in Vicia faba L.
Seen against the background of the karyotype patterns in Crocus in general and that of the 2n = 24 members of the same species, one must agree with Brighton that successive centric fissions are responsible for the observed variation.
Meiotic disruption has not been demonstrated in hybrid individuals heterozygous for the centric fission mutations that delineate most S.
1992c), the F5 and FM2 cytotypes differ by centric fissions at chromosomes 1, 3, and 6 ([ILLUSTRATION FOR FIGURE 2 OMITTED] in Sites et al.
1995), but this study provides no direct evidence for underdominance in the Tulancingo hybrid zone associated with the centric fissions of chromosomes 1, 3, 4, and 6 or the pericentric inversion of chromosome 4.
Hall (1973) attributed the morphology of chromosome 2 in the FM2 cytotype to a single centric fission of the ancestral bi-armed chromosome 2.
c] trivalent [ILLUSTRATION FOR FIGURE 4D OMITTED] was essentially identical to that observed for other centric fission trivalents in this species (Reed et al.
c] recombinants suggest that the centric fission of chromosome 2 poses no meiotic problems when in combination with the F5 chromosomal complement ([AR.