Changes

In east Asia, east Siberia, Korea, and Japan, modern humans may have been reached these areas by 35,000 years ago. This population that migrated to these regions also led to a sub-population that became the first colonizers of the Americas. It is not clear when, but between 40,000-16,500 years ago, modern humans migrated over the Beringia land bridge, connecting North America with East Asia in Russia and Alaska today, likely using the ice sheets that formed in the late glacial maximum period when ice sheets and glaciers covered many parts of North America. Recent genetic work has shown that human populations in the Amazon are genetically similar to Australoid populations, or populations that also migrated to east Asia and Australia. In effect, human migrations to the Americas likely traveled along the coastal regions between North and South America.<ref>For more on migrations in east Asia, see: Su, B., Xiao, J., Underhill, P., Deka, R., et al. (1999) Y-Chromosome Evidence for a Northward Migration of Modern Humans into Eastern Asia during the Last Ice Age. <i>The American Journal of Human Genetics.</i> [Online] 65 (6), 1718–1724.; for migrations in the Americas, see: Hey, J. (2005) On the Number of New World Founders: A Population Genetic Portrait of the Peopling of the Americas Andy G. Clark (ed.). <i>PLoS Biology.</i> [Online] 3 (6), e193. Available from: doi:10.1371/journal.pbio.0030193.</ref>

===Genetic Diversity===