Y-DNA Haplogroup Descriptions

All Haplogroup Descriptions below are taken from FamilyTreeDNA, the company I am using for my project.  I am using these descriptions with  FamilyTreeDNA's permission. 

Specific Y-DNA haplogroups are typically found in different regions of the world, and this is due to unique population histories.  In the process of spreading around the world, many populations—with their special Y-DNA haplogroups—became isolated, and specific haplogroups concentrated in geographic regions. Today, we have identified certain haplogroups that originated in Africa, Europe, Asia, the islands of the Pacific, the Americas, and even particular ethnic groups. Of course, haplogroups that are specific to one region are sometimes found in another, but this is due to recent migration.

R1a: The R1a lineage is believed to have originated in the Eurasian Steppes north of the Black and Caspian Seas. This lineage is believed to have originated in a population of the Kurgan culture, known for the domestication of the horse (approximately 3000 B.C.E.). These people were also believed to be the first speakers of the Indo-European language group. This lineage is currently found in central and western Asia, India, and in Slavic populations of Eastern Europe. 

R1b: Haplogroup R1b is the most common haplogroup in European populations. It is believed to have expanded throughout Europe as humans re-colonized after the last glacial maximum 10-12 thousand years ago. This lineage is also the haplogroup containing the Atlantic modal haplotype. 

I: The I, I1, and I1a lineages are nearly completely restricted to northwestern Europe. These would most likely have been common within Viking populations. One lineage of this group extends down into central Europe.


I1b: This subgroup of Haplogroup I is found within the Balkans countries at it's greatest frequency and diversity. These countries probably harbored this subset of Haplogroup I as a refuge during the Last Glacial Maximum.


N: This haplogroup is distributed throughout Northern Eurasia. It is the most common Y-chromosome type in Uralic speakers (Finns and Hungarians). This lineage most likely originated in northern China or Mongolia and then spread into Siberia where it became a very common line in western Siberia.


E3a: This haplogroup is an African lineage. It is currently hypothesized that this haplogroup dispersed south from northern Africa within the past 3000 years, by the Bantu agricultural expansion. E3a is also the most common lineage among African Americans.

E3b: This haplogroup is believed to have evolved in the Middle East. It expanded into the Mediterranean during the Pleistocene Neolithic expansion. It is currently distributed around the Mediterranean, southern Europe, and in north and east Africa.


J: Haplogroup J is found at highest frequencies in Middle Eastern and north African populations where it most likely evolved. This marker has been carried by Middle Eastern traders into Europe, central Asia, India, and Pakistan. The Cohen modal lineage is found in Haplogroup J*.

J2: The J2 lineage originated in the northern portion of the Fertile Crescent where it later spread throughout central Asia, the Mediterranean, and south into India. As with other populations with Mediterranean ancestry this lineage is found within Jewish populations.
Research note: Many people new to Genetic Genealogy think the J2 haplogroup is synonymous with having male Jewish ancestry. One should note that having a J2 haplogroup assignment does not necessarily indicate Jewish ancestry. The J2 haplogroup is far more ancient than the Jewish religion and is found in many lines with Mediterranean region ancient ancestry.

Q: The Q lineage is the lineage that links Asia and the Americas. This lineage is found in North and Central Asian populations as well as Native Americans. This lineage is believed to have originated in Central Asia and migrated through the Altai / Baikal region of northern Eurasia into the Americas.

Q3: This haplogroup is the only lineage strictly associated with Native American populations. This haplogroup is defined by the presence of the M3 mutation (also known as SY103). This mutation occurred on the Q lineage 8-12 thousand years ago as the migration into the Americas was underway. There is some debate about which side of the Bering Strait this mutation occurred on, but it definitely happened in the ancestors of the Native American peoples.

G: This haplogroup may have originated in India or Pakistan, and has dispersed into central Asia, Europe, and the Middle East. The G2 branch of this lineage (containing the P15 mutation) is found most often in the Europe and the Middle East.


G2: This lineage may have originated in India or Pakistan, and has dispersed into central Asia, Europe, and the Middle East. The G2 branch of this lineage (containing the P15 mutation) is found most often in the Europe and the Middle East.


C: Haplogroup C is found throughout mainland Asia, the south Pacific, and at low frequency in Native American populations. Haplogroup C originated in southern Asia and spread in all directions. This lineage colonized New Guinea, Australia, and north Asia, and currently is found with its highest diversity in populations of India.


C1: The C1 lineage is entirely restricted to Japan where it occurs at low frequency.

C2: The C2 lineage is distributed throughout the Polynesia, Melanesia, New Guinea, and Indonesia.

C3: This lineage is believed to have originated in southeast or central Asia. This lineage then spread into northern Asia, and then into the Americas.

O1: This haplogroup is found at very high frequency in the aboriginal Taiwanese (possibly due to genetic drift). This haplogroup probably originated in East Asia and later migrated into the south Pacific. Individuals carrying this lineage are thought to have been important in the expansion of the Austronesian language group into Taiwan, Indonesia, Melanesia, Micronesia, and Polynesia.

O2: Haplogroup O2 has two primary lines, the 465 line and the M95 line. Both lines are found in Asia. The 465 line is at high frequency in Japanese and Korean populations and at low frequency in east Asia. The M95 line is found in Southeast Asian populations (Malaysia, Vietnam, Indonesia, and southern China).

H: This haplogroup is nearly completely restricted to India, Sri Lanka, and Pakistan.

L: This haplogroup is found primarily in India and Sri Lanka, and has also spread into several Middle Eastern populations (Turks, Saudis, and Pakistanis).


P: The undifferentiated P lineage is a very rare haplogroup in populations at this time. Although it was the ancestral line to haplogroups Q and R it is only found at low frequency in India, Pakistan, and central Asia with a most likely point of origin in either central Asia or the Altai region of Siberia.

K: The K lineage is an old lineage presently found only at low frequencies in Africa, Asia, and in the South Pacific. One descendant line of this lineage is restricted to aboriginal Australians, while another is found at low frequency in southern Europe, Northern Africa, and the Middle East. .

K2: The K2 lineage is an old lineage presently found only at low frequencies in Africa, Asia, and in the Middle East. This specific line is found at low frequency in southern Europe, Northern Africa, and the Middle East.
Famous People in History Who Were in the K2 Haplogroup: Thomas Jefferson.