pallidipennis populations sited at lower altitudes tend to support larger individuals, where pericentric inversions
are more frequent (Colombo 2014).
The frequency of pericentric inversions
among the commonest chromosomal rearrangements is 1-2%.
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.
Two pericentric inversions
, inv(2) (p11q13) and inv(5)(p13q13), in a patient referred for psychiatric problems.
The relative length of chromosomes 1 to 18 was not different between the species, but 5 of their chromosomes (numbers 4, 7, 9, 11, & 18) were significantly different in relative lengths of short and long arm and in centromeric index, differences that can be explained by pericentric inversions
The most commonly observed rearrangements were centric fusions, tandem fusions and pericentric inversions
The sex chromosomes consist of three variations of subtelocentric, telocentric, and metacentric types caused by two pericentric inversions
and conduct the different sex determining systems (19,20).
severum (Heckel, 1840), which show a smaller number, mainly through robertsonian rearrangements and pericentric inversions
are not protected in this manner.
White (1949) and Coleman (1948) found that within-Urthoptera pericentric inversions
were mainly observed in three genera, Trimerotropis, Circotettix and Aerochoreutes (band-winged grasshoppers, Oedipodinae), referring to them as "trimerotropines" to reflect their relatedness [Aerochoreutes was later removed from synonymy to Circotettix (Utte 1984)].
Heterosynapsis and suppression of chiasmata within heterozygous pericentric inversions
of the Sitka deer mouse.
The Moreton and Torresian taxa differ by fixed pericentric inversions
at 7 of 12 chromosomal pairs.