| genetic variation in the mitochondrial 16s rrna gene of the american dog tick, dermacentor variabilis (acari: ixodidae). | genetic variation in the mitochondrial (mt) 16s ribosomal rna (rrna) gene was examined for the american dog tick, dermacentor variabilis (say, 1821). nine different haplotypes were detected among 369 adult d. variabilis collected from four localities in canada. there were eight variable nucleotide positions in the 404 bp sequence alignment. individuals of haplotype 1 occurred at frequency of >75% at all localities. five haplotypes were detected at only one of the four localities. high haplotype ... | 2010 | 20618663 |