Rahul Sharma (Editor)

Haplogroup BT

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Possible time of origin
  
70,000-80,000 years BP

Ancestor
  
A2-T

Possible place of origin
  
Africa

Descendants
  
B-M60, CT

Haplogroup BT

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.

  • 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.

    References

    Haplogroup BT Wikipedia