Thursday, January 24, 2008

Guest Speaker talks of "Evolution"




Today Dr. Louise S. Mead of the National Center for Science Education presented the ideas and evidence for evolution. She explained that evolution is the change in a species over time. Because of evolution, everything on earth is related to a common ancestor. Another important fact she strained on was that Darwin was the first man to efficiently explain evolution with evidence and details.

Next she talked about the main processes of evolution, each responsible for the variety of species we have today. They were natural selection, genetic drift, evo-devo, and lastly, mutation.

A power point was also presented to help us further understand the details of evolution. It displayed five types of evidence for evolution:
1. Biogeography: distributions of fossils around the world and how they got there
2. Comparative Anatomy: distribution of similar characteristics in the great diversity of species




3. Molecular Biology: study of how the number of human chromosomes and DNA differed from other species
4. Fossil Record: how vertebrates came to live on the land; distribution of fossils
5. Developemental Biology: comparison of genes

Overral this presentation helped me better understand the concept of evolution and the evidence of how it came about. I appreciate the time Mead took to fully break down the word "evolution."
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NATIONAL CENTER FOR SCIENCE EDUCATION

http://ncseweb.org/ ------------------------------