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Genetic coadaptation in the chromosomal polymorphism of Drosophila subobscura II. Changes of gametic disequilibrium in experimental populations |
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| Authors: | C. Zapata G. Alvarez M. Dosil A. Fontdevila |
| Affiliation: | (1) Departamento de Genética, Facultad de Biología, Universidad de Santiago de Compostela, Santiago de Compostela, Spain;(2) Present address: Departemento de Genética, Facultad de Ciencias, Universidad Autónoma de Barcelona, Bellaterra (Barcelona), Spain |
| Abstract: | Experimental populations were examined for temporal changes of gametic disequilibria between allozyme loci (Lap and Pept-1) and gene arrangements of the O chromosome of Drosophila subobscura (Ost and O3+4+7) under several environmental conditions. In the foundation of the experimental populations a genetic perturbation was carried out in order to test the relevance of the current hypotheses used to explain the allozyme-inversion associations observed in natural populations. Differential changes of gametic disequilibria were detected over generations under the different environmental conditions. Mere mechanical or stochastic factors cannot explain the results and natural selection is probably the major agent generating the detected gametic associations. The observations are interpreted as a proof of coadaptation of D. subobscura inversions. |
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