Haplogroup O2 (Y-DNA)

In human genetics, Haplogroup O2 (P31, M268) is a Y-chromosome DNA haplogroup.
Haplogroup O2 is a descendent branch of the greater Haplogroup O.

Distribution

Although Haplogroup O2 is not found so frequently in modern human populations as its brother clade, Haplogroup O3, it is notable for the peculiarities of its geographical distribution. Like all clades of Haplogroup O, Haplogroup O2 is found only among the males of modern Eastern Eurasian populations. However, unlike Haplogroup O3, which is shared in common by almost all populations of Eastern Eurasia as well as many populations of Oceania, Haplogroup O2 is generally found only among certain populations, such as the Austroasiatic peoples of India, Bangladesh and Southeast Asia, the Nicobarese of the Nicobar Islands in the Indian Ocean, and the Koreans, Japanese, and southern Tungusic peoples in China.

Besides its widespread and patchy distribution, Haplogroup O2 is also notable for the fact that it can be divided into two major subclades that show almost completely disjunct distribution. One of these subclades, Haplogroup O2a (M95), is found among some (mostly tribal) populations of South and Southeast Asia, as well as among the Khmers of Cambodia and the Balinese of Indonesia. The other major subclade, Haplogroup O2b (SRY465, M176), is found almost exclusively among the Japanese, Koreans, and Manchurians.

Sources

• Y-DNA Haplogroup Descriptions

See also

• Human Y-chromosome DNA haplogroups

Evolutionary tree of Human Y-chromosome DNA (Y-DNA) haplogroups

most recent common Y-ancestor

A

A1b

A1a-T

A1a

A2-T

A2

A3

BT

B

CT

DE

CF

D

E

C

F

G

H

IJK

IJ

K

I

J

LT

K(xLT)

L

T

M

NO

P

S

O

N

Q

R

Y-DNA by populations · Famous Y-DNA haplotypes