underhill et al groups based on y chromosome the following is extracted from the archives mainly for the referenced article is readily available online at it is well worth reading very closely jan utc here is a summary of a phylogenetic tree based on analysis of the y chromosomes of individuals from around the world the tree comes from it has population clusters but only captures of the variation in the haplotypes that is many of the haplotypes are spread in various ways amongst the identified groups the details are given in a table in the paper underhill et al did not have adequate data on new guinea and australia and so created a single group for them all it looks as though they may have missed some interesting areas altogether in the following x y means x and y are leaves that are directly joined together a b is just the name of a single group the tree has three main lobes a b c a sardinia sudan ethiopia b america mali khoisan s africa c africa new guinea australia grouped for lack of data cambodia laos japan taiwan china c europe basque morocco mideast c asia siberia hunza pakistan india peak dec utc end