Effects and maintenance of a pericentric inversion polymorphism in the grasshopper aiolopus strepens

ABSTRACT Seven natural populations of the grasshopper _Aiolopus strepens_ were analysed to investigate the effects of a pericentric inversion in the smallest chromosome (S11) on chiasma

formation and nucleolus organizer regions (NORs) activity. This polymorphism was stable in one population after comparing the frequencies of standard and inverted S11 chromosomes in two

samples taken 5 years apart. Furthermore, mean cell chiasma frequency in this population tended to decrease over these 5 years. Males homozygous for the S11 inversion showed a higher

frequency of inactivity of one of the NORs located on the L3 chromosome than that found in standard homozygous and heterozygous males. The results suggest that this stable polymorphism is

maintained by heterosis, and that inversion homozygotes are less fit than standard homozygotes, which explains the low frequency of inverted chromosomes in all populations analysed. However,

the possibility of recurrence of the inversion cannot be ruled out. SIMILAR CONTENT BEING VIEWED BY OTHERS PERICENTROMERIC RECOMBINATION SUPPRESSION AND THE ‘LARGE X EFFECT’ IN PLANTS

Article Open access 07 December 2023 HIGH DYNAMISM FOR NEO-SEX CHROMOSOMES: SATELLITE DNAS REVEAL COMPLEX EVOLUTION IN A GRASSHOPPER Article 04 June 2020 TESTING THE EVOLUTIONARY THEORY OF

INVERSION POLYMORPHISMS IN THE YELLOW MONKEYFLOWER (_MIMULUS GUTTATUS_) Article Open access 29 November 2024 ARTICLE PDF REFERENCES * Cabrero, J, Alche, J D, and Camacho, J P M. 1987.

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ACKNOWLEDGEMENTS This work was partially supported by grants from the Direccion General de Investigation Cientifica y Técnica (no. PB87-0886) and Plan Andaluz de Investigation, Grupo no.

3094 (Spain). AUTHOR INFORMATION AUTHORS AND AFFILIATIONS * Departamento Biologia Animal, Ecologia y Genética, Facultad de Ciencias, Universidad de Granada, Granada, 18071, Spain E Viseras 

& J P M Camacho Authors * E Viseras View author publications You can also search for this author inPubMed Google Scholar * J P M Camacho View author publications You can also search for

this author inPubMed Google Scholar RIGHTS AND PERMISSIONS Reprints and permissions ABOUT THIS ARTICLE CITE THIS ARTICLE Viseras, E., Camacho, J. Effects and maintenance of a pericentric

inversion polymorphism in the grasshopper _Aiolopus strepens_. _Heredity_ 66, 325–331 (1991). https://doi.org/10.1038/hdy.1991.41 Download citation * Received: 12 July 1990 * Issue Date: 01

June 1991 * DOI: https://doi.org/10.1038/hdy.1991.41 SHARE THIS ARTICLE Anyone you share the following link with will be able to read this content: Get shareable link Sorry, a shareable link

is not currently available for this article. Copy to clipboard Provided by the Springer Nature SharedIt content-sharing initiative KEYWORDS * _Aiolopus strepens_ * chiasma frequency * NOR

activity * pericentric inversion