EEB 2202 Lecture Notes - Lecture 2: Denisovan, Melanesians, Y Chromosome
26 Jan 2017
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Document Summary
Origins and spread of modern humans, migration. A third hypothesis combines features of these two: assimilation . Modern humans arose by means of evolution from ancestors. Multi regional= populations of ancestral humans in different parts around the world. Different populations would migrate, come in contact with other populations, and inter-breed. Eventually gene pool gets mixed up and outcome=modern homo sapiens. Predictions: ancestors cannot be traced to single region of origin genetic lineages should trace back farther than 200,000 years. Modern humans arose in africa and migration came out of africa into different parts of the world. Prediction: all ancestors lived in africa ~200,000 yrs ago. H. erectus and heidelbergensis fossils found widely across the globe. But oldest fossils of anatomically modern" humans are found in africa and age is <200 kya. First place we see homo sapiens= east africa. Earliest homo sapiens outside of africa = 92 kya. Genetic evidence (supports out of africa hypothesis)
