Haplogroup BT

[2] Later Stone Age individuals excavated at Fingira Rock, Malawi, dated to around 6100 years ago (2/2 males), and at Mount Hora, Malawi, dated to around 8000 years ago (1/1 males), all belonged to Y haplogroup BT(xCT).

[3][a] Basal BT* has not been documented in any living individuals or ancient remains.

In some cases, because testing is undertaken only for geographically and historically likely haplogroups, the data required to identify a precise subclade has not been collected and/or recorded.

For instance, research published in 2013, regarding a sample of more than 2,000 men from different parts of Africa, included 7.5% belonging to haplogroup BT(xDE,K).

[5] Prior to 2002, there were in academic literature at least seven naming systems for the Y-Chromosome Phylogenetic tree.

The revised y-chromosome family tree by Cruciani et al. (2011) compared with the family tree from Karafet et al. (2008). Cruciani et al. (2011) define BT via M91 and P97, and as a consequence, ISOGG has listed BT since February 2012, and treated M91 as defining mutation for BT since 2014. [ 6 ]