A genetic study helps confirm the theory that Polynesians, who settled islands across a vast swathe of ocean, started out in Taiwan, researchers reported on Monday. Mitochondrial DNA, which is passed along virtually unchanged from mothers to their children, provides a kind of genetic clock linking present-day Polynesians to the descendants of aboriginal residents of Taiwan. Samples taken from nine indigenous Taiwanese tribes -- who are different ethnically and genetically from the now-dominant Han Chinese -- show clear similarities between the Taiwan groups and ethnic Polynesians, Jean Trejaut and Marie Lin of Mackay Memorial Hospital in Taipei and colleagues reported....
