Abstract
Summary — Seventeen French natural populations of Drosophila melanogaster were analyzed to detect linkage disequilibrium between pairs of 6 polymorphic allozyme loci. The estimates of linkage disequilibrium were made from azygotic frequencies using both Burrows’ and Hills’s methods. No difference between these 2 methods was found. The amount of significant linkage disequilibrium detected was small and similar to those in other natural populations of D. melanogaster. Out of the 15 combinations examined, only 2 pairs, Adh-a-Gpdh and Est-C-Est-6, showed a consistent significant linkage disequilibrium in the populations studied. However, for the first pair, the result was probably due to an association between the loci and the inversion (2 L) t of the second chromosome. For the Est-C-Est-6 pair, the disequilibrium detected might result from an interaction effect between the 2 genes inter se. These results again show the difficulties in detecting linkage disequilibrium due to epistasis between allozyme genes in natural populations.
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