B1510F07_Wrapup - Georgia Tech School of Biology Biology...

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Biology 1510/1511 Georgia Tech School of Biology Fall 2006 Biology 1510: Fall 2006 Instructors Mirjana M. Brockett Jung Choi B. Lock Rogers Organization Five modules, each dealing with a major area of modern biology. Each module is followed by an exam and includes a group activity.
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Biology 1510/1511 Georgia Tech School of Biology Fall 2006 Module 1: Evolution What is science? Major themes What is life? Earth history Origin of life Evolution and history of life Mechanisms of evolution Speciation
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Biology 1510/1511 Georgia Tech School of Biology Fall 2006 “Tree of Life” All organisms we know of on Earth today are descended from a common ancestor that lived about 4 billion years ago. Bacteria Eukarya Archaea 4 Symbiosis of chloroplast ancestor with ancestor of green plants 3 Symbiosis of mitochondrial ancestor with ancestor of eukaryotes 2 Possible fusion of bacterium and archaean, yielding ancestor of eukaryotic cells 1 Last common ancestor of all living things 4 3 2 1 1 2 3 4 0 Billion years ago Origin of life Campbell & Reece, Fig. 25.18
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Biology 1510/1511 Georgia Tech School of Biology Fall 2006 Earth History Campbell & Reece, Fig. 26.10 & Tbl. 26.1
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Georgia Tech School of Biology Fall 2006 Biology 1510/1511 Earth 3 Billion Years Ago Campbell & Reece, Fig. 26.01
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Biology 1510/1511 Georgia Tech School of Biology Fall 2006 Banded Iron Formations (Image courtesy of Dr. Pamela Gore, Georgia Perimeter College) (Hayes, 2002, Nature 417: 127-128)
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Biology 1510/1511 Georgia Tech School of Biology Fall 2006 Diversity and Extinction Cambrian Proterozoic eon Ordovician Silurian Devonian Carboniferous Permian Triassic Jurassic Cretaceous Paleogene Neogene Number of families ( ) Number of taxonomic families Extinction rate Cretaceous mass extinction Permian mass extinction Millions of years ago Extinction rate ( Paleozoic Mesozoic 0 20 60 40 80 100 600 500 400 300 200 100 0 2,500 1,500 1,000 500 0 2,000 Ceno- zoic Campbell & Reece, Fig. 26.08
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Biology 1510/1511 Georgia Tech School of Biology Fall 2006 Basic Mechanics of Evolution Excess production Populations tend to increase exponentially when most/all offspring survive to adulthood. But most populations are relatively stable in size, so mortality must be important. Genetic variation Individuals often differ significantly in survival and reproductive success. Selection The set of genes passed from one generation to the next is biased toward those carried by the more successful individuals. Natural selection is simply differential success in reproduction. Evolution As long as variation is heritable and not simply due to environmental factors, differential success in survival and reproduction will lead to changes in a population through time. Population of organisms Hereditary variations Differences in reproductive success Evolution of adaptations in the population Overproduction and struggle for existence Campbell & Reece, Fig. 1.2
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Biology 1510/1511 Georgia Tech School of Biology Fall 2006 Origin of Species Anagenesis Gradual change in a single lineage through time until the descendants are
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This note was uploaded on 04/07/2008 for the course BIO 1510 taught by Professor Unknown during the Fall '07 term at Georgia Institute of Technology.

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B1510F07_Wrapup - Georgia Tech School of Biology Biology...

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