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Polymorphism of the Mdg-1 and I mobile elements in Drosophila melanogaster

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Abstract

The polymorphism of the mobile elements Mdg-1 (a copia-like element) and I (an element involved in I-R hybrid dysgenesis) was analysed in a mass-mated population of Drosophila melanogaster by in situ hybridization, using biotinylated DNA probes, on polytene chromosomes. The Mdg-1 and I elements were inserted independently but were within the same bulk of DNA insertion points of the Drosophila genome, which contained on average about 30 insertion sites for each element. The X chromosome contained the lowest copy number of elements while 2R and 3R had the highest number: 3R had the highest variability. There was no correlation between the copy numbers of elements among the chromosome arms. The average expected per locus heterozygosity was equal to 0.17 for both the Mdg-1 and the I elements. Although these two elements differ in sequence, they appeared to behave similarly in the Drosophila melanogaster genome. This suggests that they may compete for target insertion sites and may be under the same control mechanisms.

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  1. Population Biology Laboratory, University Lyon 1, F-69622, Villeurbanne, France

    C. Biémont

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  1. C. Biémont
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Biémont, C. Polymorphism of the Mdg-1 and I mobile elements in Drosophila melanogaster . Chromosoma 93, 393–397 (1986). https://doi.org/10.1007/BF00285819

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  • DOI: https://doi.org/10.1007/BF00285819

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