Mitochondrial DNA variation in Drosophila pseudoobscura and related species in Pacific Northwest populations

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Abstract
Mitochondrial DNA (mtDNA) from Pacific Northwest populations of D. pseudoobscura, D. persimilis and D. miranda was analyzed using 6 restriction enzymes. HpaII restriction sites were hypervariable compared to the other enzymes used. This hypervariability allows construction of a maximum parsimony map linking each mtDNA genotype. Small insertions, possibly tandem duplications, appear to have arisen concomitantly with, or subsequently to, speciation events, perhaps within the A + T rich region. Convergence of mtDNA genotypes was also evident. Unlike findings for other populations of these species, little evidence of mitochondrial introgression between D. pseudoobscura and D. persimilis was found, despite their ability to produce fertile hybrid females.