Actually the Greeks and Romans are partially the same, both 
mediterranean, Greeks and Romans were both J2 haplotype. Romans were a 
mix of Celts and Mediterranean Etruscans. Etruscans and Greeks are the 
same people genetically. Proto Greeks (Dorians and Myceneans) were R1a 
northerners probably of Seima-turbino culture. Indigenous minoans and 
Pelasgians of Greece were Mediterranean like Etruscans. In fact that's 
how mediterranean J2 got spread around Europe - by the Romans.
      
http://www.youtube.com/watch?v=aZAunpOGv8k 
