Chapter 22 - Darwinian Revolution

Chapter 22 - Darwinian Revolution - Chapter 22 The...

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Chapter 22 – The Darwinian Revolution Kenneth Kaneshiro – 436-437. Mechanisms of Evolution , interview Darwin’s Theory - heritable variation - organisms overproduce - only successful ones mate and reproduce, i.e., natural selection Biological evolution is a change of hereditary characteristics in groups of organisms. Evolutionism a descent of modification of different lineages from common ancestor Branching lineage and changes within lineage Darwin most impressed by diff varieties of pigeon readers. Victorian England – people who did science were wealthy elite. Had leisure to spend time raising pigeons and selecting all sorts of fanciful breeds. Dogs, orchids, tropical fishes. He was struck with how one could artificially select and have diff outcomes. - Continuous change over long period of time. Change across a lineage, all lineages are doing it. - Systemitist study amount of change and distinguish new species if there is enough change. Branching lineage - Terminal Taxis – Figure 22.7 page 444 (Elephant phylogeny – change through time ) - Most organisms go extinct, only ones at top are here today. What is Evolution?
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Chapter 22 - Darwinian Revolution - Chapter 22 The...

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