Transposition of the I element andcopiain a natural population ofDrosophila melanogaster

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Abstract
Summary: In order to increase our understanding of the evolutionary dynamics of transposable genetic elements we have studied the chromosal location of copies of 2 element families in 20 X chromosomes extracted from a natural population ofDrosophila melanogasterfrom Spain. The I element was localized at a total of 64 chromosomal sites andcopiaat 45 sites in this sample with a mean copy number of 3·2 and 2·3 elements/chromosome respectively. Both elements were highly variable in location, with no site reaching a higher frequency than 4/20 in either case. Comparisons with other data sets suggest that insertion frequencies can be used to detect population structuring.