FA2008 - BILD 3 - Lecture 03 (Evidence of Evolution - 01)

FA2008 - BILD 3 - Lecture 03 (Evidence of Evolution - 01) -...

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10/3/08 1 Lecture 3 Evidence of Evolution Reading Text Ch 22 Common usage – Evolution = to change Scientific usage – Evolution = change in the genetic composition (allele frequency) of a population over time (across generations) populations evolve; individuals do not Which of the following is evolution, in the scientific sense? a. A person develops cancer b. You get smarter c. A population of birds molts from summer to winter plumage d. A population of beetle larvae pupate and turn into adults e. None of the above Dogs in trash bin “Maybe one day I’ll wake up and think, ahhh, I have evolved. ..” OVERVIEW - EVIDENCE OF EVOLUTION I. EVIDENCE OF CHANGE OVER TIME A. Fossil record 1. Extinction 2. Law of succession 3. Transitional forms B. Vestigial organs II. EVIDENCE THAT SPECIES ARE RELATED C. Evidence of common ancestry 1. structural homology 2. developmental homology 2. molecular homology III. EVIDENCE OF PROCESS OF CHANGE OVER TIME D. Direct observation of changes I. EVIDENCE OF CHANGE OVER TIME A. Fossil record 1. Extinction 2. Law of succession 3. Transitional forms B. Vestigial organs II. EVIDENCE THAT SPECIES ARE RELATED C. Evidence of common ancestry 1. structural homology 2. developmental homology 2. molecular homology III. EVIDENCE OF PROCESS OF CHANGE OVER TIME D. Direct observation of changes
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10/3/08 2 1. Extinction fossil - any trace of an organism that lived in the past before 1800 people didn’t believe in extinction scientists simply had yet to find living examples of those organisms Extinction controversy ended in 1812 with the Irish elk largest antlers of any animal - 12 ft wide Irish elk fossils found throughout northern Europe Was it a moose? Reindeer? 1812 - Georges Cuvier, proved that Irish Elk was unlike any modern animal , established fact of extinction How did it go extinct? Biblical flood? “A certain Dr. MaCulloch even believed that the fossils were found standing erect, noses elevated – a final gesture to the rising flood, as well as a final plea: don’t make waves.” (Stephen Jay Gould) Irish elk lived 12,000- 11,000 years ago, warm period between two ice ages Fossil record - extinction - evidence of evolution Fossilized skin of hadrosaur Teeth of extinct megalodon shark “Fossil Mysteries” SDNHM I. EVIDENCE OF CHANGE OVER TIME A. Fossil record 1. Extinction 2. Law of succession 3. Transitional forms B. Vestigial organs II. EVIDENCE THAT SPECIES ARE RELATED C. Evidence of common ancestry 1. structural homology 2. developmental homology 2. molecular homology III. EVIDENCE OF PROCESS OF CHANGE OVER TIME D. Direct observation of changes
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10/3/08 3 Law of succession:
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This note was uploaded on 03/31/2009 for the course BILD 632282 taught by Professor Henter during the Spring '08 term at UCSD.

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FA2008 - BILD 3 - Lecture 03 (Evidence of Evolution - 01) -...

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