Using a sample of over two thousand STR haplotypes of people belonging to y-Haplogroups I1 and I2, I have constructed a tree of how those STR haplotypes are organised. Due to the randomness of mutations, such an STR tree is not expected to be exactly the same thing as the real genealogy. But it is a useful approximation. For the I1 and I2 Tree see the "UPDATE7: y-Haplogroups I1 and I2 Tree" section near the bottom of http://www.goggo.com/terry/HaplogroupI1/ That section includes a high-resolution PDF file of the reconstructed I1 and I2 Tree, plus a medium resolution image. Terry