pericentric inversion


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Related to pericentric inversion: isochromosome, reciprocal translocation

pericentric inversion

[‚per·ə′sen·trik in′vər·zhən]
(genetics)
An aberration resulting from a break in each arm of a chromosome and rejoining with the middle fragment containing the centromere now inverted with respect to the two terminal fragments.
References in periodicals archive ?
Analysis of 25 metaphase cells showed a pericentric inversion of one chromosome 21, with the breakpoint in the short arm at 21p12 and in the distal region of long arm at 21q22: 46, xx, inv (21) (p12; q22) in all cells (Fig.
Thus, the fact that silver impregnation revealed only one active NOR in Cytotype C2 (Figure ld) with the certainty that another rDNA cistron is present in the element of the pair No 1 that probably arose by pericentric inversion, lead to suggest that this NOR cluster could be inactivated after inversion by the loss of sequences involved with the transcriptional control of these genes, thus impeding the activity of those genes during the previous interphase, explaining the presence of a hybridization signal with the probe 18S rDNA on the tip of this chromosome, although without expression as demon strated by silver nitrate.
Pericentric inversion of chromosome 9 in prenatal diagnosis and infertility.
Section B comprises those species of Trimerotropis in which some of the chromosomes have become metacentric (V-shaped), as a consequence of pericentric inversions.
A letter "C" for chromosome 4 denotes the pericentric inversion [ILLUSTRATION FOR FIGURE 2 OMITTED].
The Moreton and Torresian taxa differ by fixed pericentric inversions at 7 of 12 chromosomal pairs.
pallidipennis populations sited at lower altitudes tend to support larger individuals, where pericentric inversions are more frequent (Colombo 2014).
He chose an exceptional group of Acrididae for his cytogenetic work, the Oedipodinae genera Trimerotropis and Circotettix (White 1949, 1951); in these he pioneered studies on the effects of pericentric inversions (and other rearrangements) on meiosis and on racial and specific differentiation in grasshoppers.