8.29.07 - Dr Susan Foster BIOL 105 Evolution 8.29.07...

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Dr. Susan Foster BIOL 105 – Evolution 8.29.07 Evolution I: All of the changes that have transformed life on earth from its earliest beginnings to the diversity that characterizes life today. (Most books are just descriptions of evolutionary biology.) History of Life Description a The fossil record alone is not enough evidence. (Whole pieces of history can be lost by flooding washing away fossils as the sediments settle) b The fossil record is selective due to the fact that only hard fossils will be preserved (jellyfish don’t have any body parts hard enough to sit around while sediment forms the fossils). c Small fossils (molecules that are organic molecules that are our evidence of early life). d The organisms that lived on earth were affecting the formation of the earth (oxygen accumulation due to photosynthetic autotrophs). Phylogenetic Relationships a Phenotype is the interaction between environment and genes. b To identify real relatives through DNA synthesis to construct a phylogeny. Evolutionary Pattern a Extinction i Spread of disease ii Enormous volcanic activity due to impact of meteor (time of dinosaurs) iii
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