1.Evolution

1.Evolution - Principles of Evolution What is evolution?...

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Principles of Evolution
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What is evolution? The accumulation of inherited changes within a POPULATION over time. Population: group of individuals of 1 species that live in the same geographic area at the same time. Species: organisms with similar structures, function & behavior that can interbreed.
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How do we know thing have changed? Fossils Remains of dead organisms which are preserved in rock
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Fossils develop in different ways.
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Uniformitarianism The hypothesis that the earth developed slowly through natural processes. Index Fossils Certain organisms that characterize a large geographical area.
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Other ways to date fossils Radioisotopes Emit radiation & change into different elements as they decay Radioactive Decay Break down of radioisotope Uranium – 235 = Lead – 207 Half Life Time required for ½ an atom of radioisotope to change into a different atom
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2. The number of fossils decreases but the number of species increase. 3. Fossil species remain constant. 4. Lower fossils resemble living species. 5. Fossil forms are arranged in random patterns. Assume it’s possible to remove continuous cores of rock from the earth 6 inches in diameter and 3000 feet long. Uniformitarianism would predict which of the following about the fossils in such cores as they are examined from top to bottom?
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Jean Baptiste Lamarck Developed the hypothesis of “Inheritance of Acquired Characteristics” This hypothesis stated that parents could pass along their acquired characteristics to their off spring. Could this work?
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1. humans should no longer have an appendix.
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This note was uploaded on 06/23/2011 for the course BIO 111 taught by Professor Tatum/parker during the Spring '11 term at St. Xavier.

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1.Evolution - Principles of Evolution What is evolution?...

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