Abstract
In situ hybridization on polytene chromosomes of Drosophila melanogaster was used to compare the insertion patterns of copia and mdgl transposable elements on chromosome 2 in male gametes sampled by two different methods: (i) by crossing the males tested with females from a highly inbred line with known copia and mdgl insertion profiles; (ii) by crossing the same males with females from a marked strain, and analysing the resulting homozygous chromosomes. Crossing of the males with the inbred line led to homogeneous insertion profiles for both the copia and mdgl elements in larvae, thus giving an accurate estimation of the patterns in the two gamete classes of each male. Crossing with the marked strain led, however, to heterogeneity in insertion patterns of the copia transposable element, while no significant polymorphism was observed for mdgl. The use of balancer chromosomes is thus not an adequate way of inferring transposable element insertion patterns of Drosophila males, at least for the copia element. This technique could, however, be powerful for investigating the control of movements of this element.
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Garcia Guerreiro, M.P., Biémont, C. Changes in the chromosomal insertion pattern of the copia element during the process of making chromosomes homozygous in Drosophila melanogaster . Molec. Gen. Genet. 246, 206–211 (1995). https://doi.org/10.1007/BF00294683
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DOI: https://doi.org/10.1007/BF00294683