Your deep ancestors

I'm haplogroup I M170. Does somebody know to which peoples my ancestors belong? 

The title made me think of fish for some reason.

Where would I find out which haplogroup I am in? 

What's a haplogroup?

I sent my DNA to the Genographic project.

I'm haplogroup I 1a M170, who are my ancestors? Are they Roman, Celtic, Germanic or Slavic?

Is there no biological difference between Celtic and Germanic or Slavic and Germanic peoples? Are Russians pure Slavics? Is the French people a mixture of Celtic, Roman and Gemanic peoples?

Edited by Scheich - 21-Sep-2007 at 09:14

I could guess who my "deep ancestors" were by reading about the regions from which my grandparents and their families migrated from in the 19th Century: Italy, Germany and England.  Whether or not any inherited DNA has anything to do with this doesn't quite register with me.  My best guess is that my ancestors may have been part of the Germanic migrations which took place during the declining years of the Roman Empire, either as Saxons, Goths or Lombards who migrated into England and Italy.  The German ancestors were probably part of that group which remained east of the Rhine until the 19th Century upheavals finally convinced them to move on.