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B1510F07_L05_OriginofLife

B1510F07_L05_OriginofLife - Georgia Tech School of Biology...

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Biology 1510 Georgia Tech School of Biology Spring 2007 Papilio appalachiensis dorsal Papilio appalachiensis ventral An example of a holotype specimen:
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Biology 1510 Georgia Tech School of Biology Spring 2007 Biological Variation Every measurable biological characteristic varies among individuals. Biological variation provides the basic working material for evolution. Variation arises and persists because the hereditary mechanism is good, but not perfect. Variation can be partitioned into genetic and environmental components.
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Biology 1510 Georgia Tech School of Biology Spring 2007 Why does evolution matter? “Nothing in biology makes sense, except in the light of evolution” - T. Dobzhansky
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Biology 1510 Georgia Tech School of Biology Spring 2007 Galapagos Finch Diversity Campbell & Reece, Fig. 1.23
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Biology 1510 Georgia Tech School of Biology Spring 2007 convergence (under selection): re-invention of the same body plan in unrelated groups \ (why some characters make adaptive / functional / engineering sense (the impression of design)
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Biology 1510 Georgia Tech School of Biology Spring 2007
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Biology 1510 Georgia Tech School of Biology Spring 2007
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Biology 1510 Georgia Tech School of Biology Spring 2007
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Biology 1510 Georgia Tech School of Biology Spring 2007
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Biology 1510 Georgia Tech School of Biology Spring 2007 descent with modification : why some characters are so astoundingly bad from a “design” perspective. (The ME department would surely fail this effort…)
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Biology 1510 Georgia Tech School of Biology Spring 2007 Pachyhrachis problematicus
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Biology 1510 Georgia Tech School of Biology Spring 2007 Najash rionegrina
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Biology 1510 Georgia Tech School of Biology Spring 2007
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Biology 1510 Georgia Tech School of Biology Spring 2007 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
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Biology 1510 Georgia Tech School of Biology Spring 2007 Origin of Life on Earth
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