paracentric inversion

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par·a·cen·tric in·ver·sion

inversion in a chromosome of a single segment in which the centromere is not included.

paracentric inversion

a chromosomal mutation involving INVERSION of a segment of one arm of a chromosome, not involving the CENTROMERE.


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 ?
1991) have identified paracentric inversions in two Chinese G.
Our objective was to determine if the paracentric inversions identified in G.
A pollen sterility class of 41 to 50% would represent those plants with both paracentric inversions.
The relationship of crossing over to chromosome synapsis in a short paracentric inversion.
White (1978) observed that in over 300 species of Drosophila, paracentric inversions were 200 times more common than pericentric.
If most structural changes in Aedes chromosomes are the product of centromeric translocations and paracentric inversions, we would expect to find blocks of genes corresponding to intact chromosomal elements.
The first is a reinforcement of previous observations that karyotype evolution in mosquitoes has involved several significant structural changes, mostly Robertsonian translocations and paracentric inversions.
The loci within the linkage groups have been rearranged primarily by paracentric inversions.