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BillMC
08-30-2016, 06:41 PM
Excuse my ignorance but I get the impression that I1 and I1-M253 are alternative terms for the same haplogroup. So if they are not, then what exactly is their difference/s?

Adrian Stevenson
08-30-2016, 06:49 PM
Yes, they are one and the same.

Have a look here for further info:

http://www.eupedia.com/europe/Haplogroup_I1_Y-DNA.shtml

Cheers, Ade.

BillMC
08-30-2016, 07:21 PM
why can't they just say I1? what is the significance of calling it M253?

spruithean
08-31-2016, 01:51 AM
why can't they just say I1? what is the significance of calling it M253?

Because when we get to the groups below I1-M253, like I1-L338 or so we see they have complicated combos of letters and numbers like I1a2a1a2, etc. It is far simpler to use the broad haplogroup title "I1" with the terminal SNP (M253, or Z140 or F2642, Etc etc). This idea seems to have originated mostly amongst discussions and research of the subgroups of Haplogroup R, take a look at the ISOGG tree of Haplogroup R.

Megalophias
08-31-2016, 02:57 AM
why can't they just say I1? what is the significance of calling it M253?

The terminology changes all the time. What used to be called K2-M70 is now T1a-M70. In 2007 M253 was I1a and I1 was P38. In the future maybe a branch above M253 will be found and I1 will become I1a again.

Even at the same time sometimes people call the same clade by different names. If you were looking at the current ISOGG tree you would see that N2 is provisionally defined by Page56. If you looked at the recent papers by Karmin et al and Ilumae et al N2 is used for P43, as it was a long time ago before it became N1b-P43 and then N1c2b-P43. Personally I refer to N2-Y6503.

So it is very helpful to include the mutation name to avoid ambiguity.