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  • lineage
  • The new divergent lineage, which was found in an individual who submitted his DNA to Family Tree DNA, a company specializing in DNA analysis to trace family roots, branched from the Y chromosome tree before the first appearance of anatomically modern humans in the fossil record. (eurekalert.org)
  • Our analysis indicates this lineage diverged from previously known Y chromosomes about 300,000 ago, a time when anatomically modern humans had not yet evolved," said Michael Hammer, an associate professor in the University of Arizona's department of ecology and evolutionary biology and a research scientist at the UA's Arizona Research Labs. (eurekalert.org)
  • Hammer said "the most striking feature of this research is that a consumer genetic testing company identified a lineage that didn't fit anywhere on the existing Y chromosome tree, even though the tree had been constructed based on perhaps a half-million individuals or more. (eurekalert.org)
  • About 300,000 years ago falls around the time the Neanderthals are believed to have split from the ancestral human lineage. (eurekalert.org)
  • The discovery pushes back the most recent common ancestor for the lineage tree to 338,000 years ago, before the appearance of modern humans in the fossil record. (archaeology.org)
  • Africa
  • Through large database searches, his team eventually was able to find a similar chromosome in the Mbo, a population living in a tiny area of western Cameroon in sub-Saharan Africa. (eurekalert.org)
  • base pairs
  • Fernando Mendez, a postdoctoral researcher in Hammer's lab, led the effort to analyze the DNA sequence, which included more than 240,000 base pairs of the Y chromosome. (eurekalert.org)