Increased recombination frequencies resulting from directional selection for geotaxis in Drosophila (original) (raw)

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Heredity volume 72, pages 64–68 (1994)Cite this article

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Abstract

Several classes of models have been suggested to explain how natural selection can favour non-zero recombination. Directional and fluctuating selection, abiotic and biotic, and selection against harmful mutations seem to be the most plausible factors, but little has been done to test the problem experimentally. Here we show that long-term selection for positive or negative geotaxis in Drosophila melanogaster results in a dramatic increase in recombination rates in different genomic regions. The total increment in recombination for the genome portion considered is 78 cM for geo+ and 66 cM for _geo_−. Selection for negative geotaxis did not result in recombination changes in chromosome 2 whereas selection in the opposite direction caused nearly a four-fold increase in the b-cn segment and a significant, albeit not as high, increase in the adjacent regions, al-b and cn-vg. In chromosomes X and 3, a significant increase in recombination was found in both selected lines. In total, the increment in exchange frequency in chromosome X (y-cv-ct-v-car) was from 72.6 per cent (the control level) to 124.7 and 110.3 per cent _geo_− and geo+, respectively, whereas for the studied portion of chromosome 3 (ru-h-cu-sr-e) we obtained, correspondingly, 60.8, 76.4 and 73.8 per cent. Thus, in general, selection for geotaxis resulted in increased recombination frequencies regardless of the direction of selection. These results, taken together with other data, allow one to conclude that selection for fitness traits (e.g. for changed levels of quantitative traits, behavioural peculiarities or adaptation to adverse environmental conditions) may be a powerful factor causing rather rapid changes in the recombination system.

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1. Institute of Evolution, University of Haifa, Mount Carmel, Haifa, 31905, Israel
   Abraham B Korol
2. Institute of Zoology of the Academy of Sciences, Kishinev, 277028, Moldova
   Konstantin G Iliadi

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1. Abraham B Korol
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2. Konstantin G Iliadi
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Korol, A., Iliadi, K. Increased recombination frequencies resulting from directional selection for geotaxis in Drosophila.Heredity 72, 64–68 (1994). https://doi.org/10.1038/hdy.1994.7

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• Received: 14 May 1993
• Issue Date: 01 January 1994
• DOI: https://doi.org/10.1038/hdy.1994.7

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