Haplogroup A (Y-DNA)

Haplogroup A is a human Y-chromosome DNA haplogroup. Unlike other Y-DNA clades, it is not defined by a specific mutation. It is the foundational haplogroup to all known patrilineal lineages carried by modern humans, and thus is the Y-chromosomal Adam. Formerly also known as "clade I", bearers of extant sub-clades of haplogroup A are entirely found in Africa (or among descendants of recently extracted African populations), in contrast with the descendant haplogroup BT (clade II-X) bearers of which participated in the Out of Africa migration of anatomically modern humans.

Haplogroup A (Y-DNA)

Haplogroup A is a human Y-chromosome DNA haplogroup. Unlike other Y-DNA clades, it is not defined by a specific mutation. It is the foundational haplogroup to all known patrilineal lineages carried by modern humans, and thus is the Y-chromosomal Adam. Formerly also known as "clade I", bearers of extant sub-clades of haplogroup A are entirely found in Africa (or among descendants of recently extracted African populations), in contrast with the descendant haplogroup BT (clade II-X) bearers of which participated in the Out of Africa migration of anatomically modern humans.