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Molecular Biology and Evolution, Vol 6, 123-130, Copyright © 1989 by Society for Molecular Biology and Evolution

ORIGINAL ARTICLE

Restriction-map variation at the zeste-tko region in natural populations of Drosophila melanogaster

M Aguade, N Miyashita and CH Langley
Departament de Genetica, Facultat de Biologia, Universitat de Barcelona, Spain.

Restriction-map variation in 64 X chromosome lines extracted from three different natural populations of Drosophila melanogaster was investigated with seven six-nucleotide-recognizing enzymes for a 20-kb region including the zeste and tko genes. Ten restriction-site and four length polymorphisms (two insertions and two deletions) were detected. Contrary to the predicted lower level of variation for genes on the X chromosome, the level of variation attributable to nucleotide substitution (estimated heterozygosity/nucleotide = 0.004) was similar to that previously reported for autosomal loci. The amount of insertion/deletion variation in the studied region was within the range observed in autosomal regions and thus not explainable by a simple selection model against the effects of insertional mutations. A general lack of linkage disequilibrium between polymorphic sites was observed.
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