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Lecture

Constant interbreeding between small adjacent local groups.docx

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Department
Anthropology
Course
ANTH 2231
Professor
B.Galdiks
Semester
Summer

Description
Constant interbreeding between small adjacent local groups Evidence in Support of the “Out of Africa” Hypothesis 1. Compared to other animal species modern humans have a very low degree of variability in our mtDNA. 2. There appears to be a very low degree of variability in the Y chromosome among all modern males. 3. Within modern human mtDNA, African groups appear to have the greatest degree of variability. • This strongly suggests that Africa was the place of origin for all modern humans. Dating our mtDNA point of Coalescence • As time passes, genetic variability steadily increases. • Random mutation should be the only source of variability in mtDNA. • The longer an individual species is in existence, the more these mutations will accumulate in its mtDNA. • If these mutations do occur randomly, then over long periods of time they should occur at a relatively constant rate. Another Line of Evidence: Changes in Material Cul
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