pericentric inversion

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per·i·cen·tric in·ver·sion

inversion in a chromosome of a single segment that includes the centromere.

inversion

1. a turning inward, inside out, or other reversal of the normal relation of a part.
2. a chromosomal aberration due to the inverted reunion of the middle segment after breakage of a chromosome at two points, resulting in a change in sequence of genes or nucleotides.

paracentric inversion
the inverted segment does not include the chromosome's centromere; has exactly the same size and shape as a normal chromosome but will have different banding patterns.
pericentric inversion
an inversion in a chromosome in which the centromere is included in the inverted segment.
teat inversion
the tip is invaginated so that the orifice is closed by the act of sucking. Causes a problem to sucking pigs. Affected sows should be culled.
References in periodicals archive ?
Here, we report a female who carries a unique pericentric inversion ofone chromosome 21: inv (21) (p12; q22).
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.
Pericentric inversions of chromosome 9 in Taiwanese fetuses.
For all of those chromosomes that were different (4, 7, 9, 11, and 18), pericentric inversions can be proposed to be the evolutionary force differentiating the two species.
G-band patterns reveal an apparent pericentric inversion difference between the two chromosomal forms.
Evidence for two successive pericentric inversions in sex lampbrush chromosomes of Rana rugosa (Anura: Ranidae).
Existent variability might be due to the acquisition or loss of small chromosome fragments, to non-reciprocal translocations, to pericentric inversions, and to tandem duplications or differential crossing-overs (Uribe-Alcocer et al.
The fertility effects of pericentric inversions in Drosophila melanogaster.
Section B comprises those species of Trimerotropis in which some of the chromosomes have become metacentric (V-shaped), as a consequence of pericentric inversions.
Diakinetic nuclei were examined for the frequency of chiasmata (bivalent/trivalent formation) and for frequency and incidence of crossing over within the inverted region of pericentric inversion heterozygotes.
For example, heterozygosity for the centric fission of four chromosomes (1, 3, 4, and 6) and pericentric inversion of chromosome 4 resulted in no significant meiotic problems.
Examples of pericentric inversions, partial-arm translocations, or multiple translocation/inversion events were observed less frequently.