Haplogroup BT
Haplogroup BT M91, also known as Haplogroup A1b2, is a Y-chromosome haplogroup. BT is a subclade of haplogroup A1b and a sibling of the haplogroup A1b1. Wikipedia
Ancestor: A2-T
Defining mutations: Page65.1/SRY1532.1/SRY10831.1, M42, M91, M94, M139, M299, P97, V21, V29, V31, V59, V64, V102, V187, V202, V216, V235
Descendants: B-M60, CT
Possible place of origin: Africa