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Humanist
11-14-2012, 07:24 AM
The latest edition of the Haplogroup G Newsletter (http://tech.groups.yahoo.com/group/HaploGNewsGrp/message/84), by Ray Banks:


[A] few days ago we obtained one of the first samples done in the Personal Genome Project which was done at a high resolution. We were able to detect all the previously known SNPs, so this sample likely has an extremely high percentage of Y SNPs that can be detected.

....

I will not describe the methodology here, but you can find a description in another posting of what I will not say:

http://archiver.rootsweb.ancestry.com/th/read/GENEALOGY-DNA/2012-11/1352614028

In this posting I indicated that this sample suggests the age of haplogroup G is about 46,000 yrs old. This represents the first ever calculation of the age of haplogroup G by counting SNPs. I have since found a few other SNPs, and that means the age is slightly more. Previously the age of G was estimated by using the less reliable mutations in STR markers. One study doing this estimated the age of G to be in the early 20,000s, which means it was underestimating the age by a factor of two.

lgmayka
11-14-2012, 08:50 PM
There are two different definitions of the "age" of a haplogroup:

- The haplogroup's TMRCA based on the existing known set of extended haplotypes (i.e., the age of the haplogroup's first expansion)

- The TMRCA of the haplogroup and its closest sister haplogroup (i.e., the age of the haplogroup's split from other haplogroups)

These two can differ widely. For example, the TMRCA of existing known I1 is less than 5000 years, but I1 is believed to have split off from I2 over 20,000 years ago.

soulblighter
11-15-2012, 03:04 AM
The latest edition of the Haplogroup G Newsletter (http://tech.groups.yahoo.com/group/HaploGNewsGrp/message/84), by Ray Banks:

Where is the newsletter? The one on the yahoo groups is dated sept 23rd...
Is Ray on this forum now?

Edit: found it.... I guess I was looking at his New group, which is now the Old one :)
Thanks for the heads up!

vettor
03-27-2015, 02:56 AM
I thought people on this site said there was no G2a in the caucasus

Chad has found



The Svan are an outlier with the Caucasus pops

yDNA
G2a1a-76%
G2a1c-3%
J2a1-6%
N-1%
I2-4%
R1a-10%

Estimating the MRCA of G2a at 12.6kya via STRs

Svan between Ossets and Abkhaz in YDNA frequencies.


http://en.wikipedia.org/wiki/Svans

IIRC , ossets and abkhaz are "central" caucasus people .....or is this classified as north

Humanist
03-27-2015, 03:01 AM
I thought people on this site said there was no G2a in the caucasus

Where are you getting that from? Please refer me to the exact post. Thank you.