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Molecular Biology and Evolution, Vol 13, 1266-1275, Copyright © 1996 by Society for Molecular Biology and Evolution

ORIGINAL ARTICLE

Mitochondrial gene divergence of Colombian Drosophila pseudoobscura

TM Jenkins, CJ Basten and WW Anderson
Department of Genetics, University of Georgia, Griffin 30223-1797, USA.

Isolated populations of drosophila pseudoobscura, separated from North American populations by about 2,400 km, were found in Colombia in 1960. We compared for sequences of the small ribosomal RNA (srRNA) gene on the mitochondria between North American and Colombian D. pseudoobscura in order to clarify the age of the Colombian isolates. The North American populations were not genetically different from each other but were genetically different from the Colombian populations. The Mexican strains represent the area from which the Colombian founders might have come. The estimated net nucleotide divergence between Mexican and Colombian D. pseudoobscura indicates that the Colombian population is not an ancient lineage. Phylogenies using both distance and parsimony methodologies reinforced this conclusion. The Colombian samples group together with both methods but, according to the bootstrap analysis, not significantly. It appears that the populations have not been separated long enough for their DNA sequences to show much divergence.
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