Our human Y-chromosome has experienced a number of mutations since the dawn of man. On the most part, these mutations have been identified and given a standard nomenclature. Called "haplogroups" , they have been organized by number [DYS #] and alphabetized A - T. Their chronology has been estimated, with "haplogroup A" starting things off some 60,000 years ago, or so. Their geographic locations have been identified. The following figure was drawn some six years ago when trying to put all this DNA stuff together. I thought it might be of interest in the very broadest sense.
Give it a go. If you see any errors or need for more recent information please comment. Here you have my take on the haplogroup hangouts.