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

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properties of inversions. _Evolution_, 17, 147–162. Google Scholar  Download references 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

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Springer Nature SharedIt content-sharing initiative KEYWORDS * _Aiolopus strepens_ * chiasma frequency * NOR activity * pericentric inversion