Lec26 03_28_08 Cycle of Life

Lec26 03_28_08 Cycle of Life - Lecture 26 Human origins and...

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Lecture 26. Human origins and theories of aging March 28, 2008 See Chapter 16& 17 in Cheung, Fundamental Concepts in Biology Outline The origin of modern humans Lifespan and life expectancy Theories of aging Assisted reproduction Male and female infertility
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Changes in cranial capacity Gorillas: 340-752 cc Australopithecus: 438-530 cc Homo habilis (first hominid): 590-650 cc Homo ergaster: 700 – 850 cc Homo erectus: 950 – 1100 cc Neanderthals: 1200 – 1700 Modern humans: 1100 – 1700 New born ~370 cc, 1 yr ~950; adult ~1350. Different sizes in normal adults does not appear to be related to intelligence.
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Human Brain and Reproduction
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Modern Humans From a single population of 10,000 East Africa ~100,000 ya Genetic bottlenecks Mitochondrial Eve (140,000 ya) Y-chromosomal Adam (60,000 to 90,000 ya)
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Emergence of the Modern Humans
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Out of Africa
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Spread of Modern Humans Out-of-Africa Model Multi-regional Evolution Model
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Support of Replacement Model Fossil evidence Early human fossils only in Africa Genetic evidence
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Lec26 03_28_08 Cycle of Life - Lecture 26 Human origins and...

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