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Haplogroup Q-M346
Haplogroup Q-M346 is a subclade of Y-DNA Haplogroup Q. Haplogroup Q-M346 is defined by the presence of the M346 Single Nucleotide Polymorphism (SNP). Origin and distribution Q-M346 was discovered in Central Asia and announced in Sengupta 2006. A latter paper suggested that its ancestral state was isolated to India, but this has since been refuted by its presence in West Asia, Europe and the Americas. Asia Q-M346 has a wide distribution across much of Asia. The Americas In the Americas, the founding paternal lineages include those who are Q-M346 but do not belong to the Q-M3 lineage. Associated SNPs Q-M346 is marked by the presence of the M346 SNP. Since the discovery of M346 several additional SNPs have been found to also be associated with Q-M346. These SNP's include: L56 and L57. These SNPs appear to be "parallel" to M346. Subgroups This is Thomas Krahn at the Genomic Research Center's Draft treProposed Treefor haplogroup Q-M346. The first three levels of subclade ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Before Present
Before Present (BP) years, or "years before present", is a time scale used mainly in archaeology, geology and other scientific disciplines to specify when events occurred relative to the origin of practical radiocarbon dating in the 1950s. Because the "present" time changes, standard practice is to use 1 January 1950 as the commencement date (epoch) of the age scale. The abbreviation "BP" has been interpreted retrospectively as "Before Physics", which refers to the time before nuclear weapons testing artificially altered the proportion of the carbon isotopes in the atmosphere, which scientists must now account for. In a convention that is not always observed, many sources restrict the use of BP dates to those produced with radiocarbon dating; the alternative notation RCYBP stands for the explicit "radio carbon years before present". Usage The BP scale is sometimes used for dates established by means other than radiocarbon dating, such as stratigraphy. This usage differs from t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |