Changes

Divergence in genetics began to accelerate again at about 40,000 years ago, by which time European and Asian populations began to diverge as human populations migrated into different parts of Eurasia, where the Middle East and Central Asia became an area where human populations diverged from. In southeast Asia, the Denisova hominin, an early hominid that shares an ancestor with Neanderthals, may have also bred with early modern humans, similar to Neanderthals in Europe and other parts of Asia. This could explain why up to 4-6% of southeast Asian populations' genetic makeup shows variation from other populations. Additionally, sub-Sahara African populations not only show large variation, but their genetic makeup lacks any genetic input from Neanderthals, suggesting Neanderthals never migrated to areas south of the Sahara. On the other hand, Central Asian, European, and Middle Eastern populations do show input from Neanderthals, altough not at very high rates<ref>For more on post-Africa migration genetic divergence, see: Barbujani, G. & Bertorelle, G. (2001) Genetics and the population history of Europe. <i>Proceedings of the National Academy of Sciences.</i> [Online] 98 (1), 22–25. Available from: doi:10.1073/pnas.98.1.22.</ref>

[[File:World Map of Y-DNA Haplogroups.png|thumbnail|Figure 2. Map of Y-DNA Haplogroups and the origin of genetic Adam.]]