Underhill et al 20 groups based on Y chromosome The following is extracted from the archives mainly for 195 The referenced article is readily available online at It is well worth reading very closely 06 38 18 Jan 2004 UTC Here is a summary of a phylogenetic tree based on analysis of the Y chromosomes of 1062 individuals from around the world The tree comes from It has 20 population clusters but only captures 18 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 09 04 10 Dec 2003 UTC END