What's going on with haplogroup A? What is the "everyman" SNP?

[gtc]

When I started out on this stuff a some years ago, the ISOGG tree showed M91 as the defining SNP for haplogroup A.

Given that all of men alive today are supposed to have a common male ancestor, I thought that M91 defined that link. Therefore it struck me as odd that my (V1 chip) 23andMe Y data didn't contain M91.

The current version of the ISOGG tree has moved M91 to BT. My 23andMe data for BT shows positives for M299, M42, M94 and SRY1532.1

Haplogroup A shows P305 as the defining SNP, together with a bunch of new V-series SNPs.

Unfortunately there is no "rs" number for P305 in the FTDNA Y Chromosome Browser so I can't see if it's in my 23andMe data.

So, what is the "everyman" SNP -- the one that every man alive today is positive for?

[EthiopianSon]

Something to do with the newly discovered "A00" man mentioned here?:-

http://dna-explained.com/category/wty-walk-the-y/

It's a long article but if you search for "South Carolina" you will get to the right bit.

[gtc]

Something to do with the newly discovered "A00" man mentioned here?:-

http://dna-explained.com/category/wty-walk-the-y/

It's a long article but if you search for "South Carolina" you will get to the right bit.

Yes, not long after my original post the A00 discovery was announced. Things are a lot less clear now.

[OConnor]

My Haplotree page shows Adam as the initial snp. all of the following branches are snp numbers. I don't know why they didn't name the rest of them. ;)