Transpositions of mobile dispersed genes in Drosophila melanogaster and fitness of stocks |
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Authors: | E S Belyaeva E G Pasyukova V A Gvozdev Y V Ilyin L Z Kaidanov |
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Affiliation: | (1) Institute of Molecular Genetics, USSR Academy of Sciences, Kurchatov Sq. 46, 123182 Moscow, USSR;(2) Institute of Molecular Biology, USSR Academy of Sciences, USSR;(3) Department of Genetics and Breeding, Leningrad State University, Leningrad, USSR |
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Abstract: | Summary In situ hybridization with polytene chromosomes was used to demonstrate the transposition of mobile dispersed genes (mdg)-1 and 3 following the selection of flies from low reproductive activity and vability (LA stock) for high reproductive activity, viability and fitness (LA+ and HA stocks).The inbred LA stock is continuously selected for low reproductive activity and viability and maintains at least for twentyfive generations a characteristic pattern of mdg-1 distribution in 14–15 sites. Inbred LA+ and HA stocks exhibit a changed pattern of mdg-1 locations and the number of sites reaches 21–25. Parallel and independent selection for higher viability may lead to similar characteristic changes in the localization of mdg-1.In several independent experiments we observed, within one generation, a spontaneous and saltatory growth of viability and fitness in the mass-bred LA stock. In these cases new mdg-1 and mdg-3 sites reproducibly appeared to within several bands, some of them characteristic of LA+ and HA stocks.We discuss the possible role of mdg in determining the quantitative characters of individuals and their fitness. |
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