title: Human migrations: the two roads taken.
abstract: America was peopled from Asia by at least the end of the last ice age, but the exact timing of entry and the composition of the source population are unclear. A new analysis of two rare mitochondrial haplogroups suggests two separate Asian migrations into the Americas, indicating simultaneous but independent Asian source populations for early American colonists.
authors.affiliation: Department of Anthropology, University of Utah, 270 S. 1400 E., Rm. 102, Salt Lake City, UT 84112, USA. orourke@anthro.utah.edu
authors.forename: Dennis H
authors.initials: DH
authors.lastname: O'Rourke
mesh_terms: D000569:Americas; D001208:Asia; D004272:DNA, Mitochondrial / Q000235:genetics*; D004641:Emigration and Immigration; D019143:Evolution, Molecular; D005787:Gene Frequency; D014644:Genetic Variation; D005843:Geography; D006801:Humans; D017422:Sequence Analysis, DNA
chemical_list: D004272:DNA, Mitochondrial