Nucleotide Polymorphism at the rp49 region of Drosophila subobscura: Lack of geographic subdivision within chromosomal arrangements in Europe

Abstract

Restriction‐site polymorphism at the rp49 gene region has been studied in 234 lines of Drosophila subobscura representing different gene arrangements for the O chromosome. The population surveyed (El Pedroso, Spain) was sampled four times in each of two consecutive years. The data indicate that the two chromosomal classes studied, OST and O3 + 4, are genetically differentiated in El Pedroso. Comparison of the present results with those previously obtained for two other populations further supports that, for a given chromosomal class, European populations are not genetically differentiated. This lack of differentiation at the rp49 region within OST and within O3 + 4 stands in contrast to the clear latitudinal clines found in Europe for these arrangements. Copyright © 1995, Wiley Blackwell. All rights reserved