Mitochondrial DNA Sequence Divergence and Phylogenetic Relationships among Eight Chromosome Races of the Sceloporus Grammicus Complex (Phrynosomatidae) in Central Mexico

摘要: A 2,479-base pair mitochondrial DNA fragment was sequenced for eight chromosome races of Sceloporus grammicus from central Mexico to estimate their phylogenetic relationships. The species S. poinsetti and olivaceus were used separately as alternative outgroups. total 795 positions varied in three complete protein-coding genes examined (ND3, ND4L, ND4), 52 292 across five transfer RNAs (glycine, argenine. histidine, serine, leucine). Sequence divergence values ranged 0.0 0.23 among the ingroup taxa, a maximum 0.26 observed between outgroup taxa. Alternative analyses based upon equally weighted characters several character-weighting options obtain hypotheses complex, single most-parsimonious tree selected these on basis new method that takes into account frequencies all 12 possible substitutions protein