Haplogroup BT
| Haplogroup BT | |
|---|---|
 | |
| Possible time of origin | 70,000-80,000 years BP[citation needed] |
| Possible place of origin | Africa |
| Ancestor | A2-T |
| Descendants | B-M60, CT |
| Defining mutations | Page65.1/SRY1532.1/SRY10831.1, M42, M91, M94, M139, M299, P97, V21, V29, V31, V59, V64, V102, V187, V202, V216, V235 |
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.[1]
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.
See also
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Footnotes
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References
- ^ 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.
- ^ ISOGG Haplogroup A (2012): "BT is shown on this tree, though it is not considered to be a part of Haplogroup A, in order to make it clear that, as a sibling clade of A1b1, BT and all other haplogroups are downstream of A1b. Listed 15 February 2012." (also note that the group labelled "A1b" in the image is the "A0" of ISOGG (2012)).
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