paracentric inversion

(redirected from Chromosomal inversion)
Also found in: Dictionary, Encyclopedia, Wikipedia.
Related to Chromosomal inversion: Chromosomal deletion, Chromosomal translocation

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.

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 ?
The transposon Galileo generates natural chromosomal inversions in Drosophila by ectopic recombination.
2009 Chromosomal inversions and species differences: when are genes affecting adaptive divergence and reproductive isolation expected to reside within inversions?
Unfortunately, chromosomal inversions in mosquitoes found in Algeria could not be assessed because of lack females at the half-gravid stage (during blood digestion and egg development).
Though it's not clear what these chromosomal inversions do for the insects, researchers have noticed that the reversals follow a pattern: Wild fruit flies at the same latitude tend to have similar patterns of inversions, with the patterns shifting in a gradient extending northward from the equator.
Information on both is essential to understand the processes underlying the origin and success of chromosomal inversions.