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Haplogroup BT M91 also known as Haplogroup A1b2 (and formerly as A4, BR and BCDEF) is a Y-chromosome haplogroup. BT is a subclade of Haplogroup A1b (P108) and a sibling of Haplogroup A1b1 (L419/PF712). Macrohaplogroup BT has been found in populations on every continent, since prehistoric times. It is the parent of Haplogroups B and CT. However, the basal paragroup BT * has not been found in modern populations. ==Phylogenetics== The ISOGG tree since 2014 has treated M91 as the defining mutation of BT.〔 ( Y-DNA Haplogroup A and its Subclades - 2012 ) (BT as subclade of A1b-P108) (Y-DNA Haplogroup A and its Subclades - 2014 ) (BT as subclade of A1b-P108); (Y-DNA Haplogroup Tree 2015 ) (BT-M91 listed as subclade of A1a-M31). ISOGG has listed M42 as a mutation characteristic (but not defining) of BT since 2012.〕 *B M60, M181, P85, P90 *CT P9.1, M168, M294 Prior to 2002, there were in academic literature at least seven naming systems for the Y-Chromosome Phylogenetic tree. This led to considerable confusion. In 2002, the major research groups came together and formed the Y-Chromosome Consortium (YCC). They published a joint paper that created a single new tree that all agreed to use. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Haplogroup BT」の詳細全文を読む スポンサード リンク
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