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CTools010711lecture02 - Biology 172 Lecture 2 Friday...

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Lecture 2: Friday, January 7, 2011 Biology 172 Today’s Outline Announcements • If you wish to enroll or have  any questions related to  adding/dropping/changes in  this course, please contact the  Course Coordinator, Dr. Diane  Spillane ([email protected]). Unifying Themes of Biology Cell Theory Development of cell theory Statement of cell theory Scientific Method, Critical Thinking Review of Chemistry  • Chemical bonds  • Water  • Functional Groups
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Evolution accounts for both the unity and the diversity of life Descent with modification from a common ancestor.
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Using Molecules to Understand the Tree of Life Closely related species should have rRNA sequences that are more similar than those from distantly related species because they share a more recent common ancestor. Thus, small subunit rRNA sequences can be used to produce a phylogenetic tree showing probable evolutionary relationships.
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…with the nucleotide sequence found at the same location in the rRNA molecule of green algae Compare the rRNA nucleotide sequence observed in land plants… Figure 1.4
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-Proteobacteria Animals, fungi, and plants are small branch tips on the tree of life -Proteobacteria -Proteobacteria -Proteobacteria -Proteobacteria Firmicutes DOMAIN BACTERIA Cyanobacteria Spirochaetes Chlamydiae Actinobacteria DOMAIN ARCHAEA Methanococcus Korarchaeota Pyrococcus Archaeoglobus Thermoplasma Sulfolobus Aeropyrum DOMAIN EURKARYA Diplomonads Ciliates Diatoms Brown algae Oomycetes Foraminifera Land plants Animals Slime molds Fungi Green algae Red algae Dinoflagellates Apicomplexa This node represents the common ancestor of archaea and eukaryotes This node represents the common ancestor of all organisms alive today Fig 1.5 Bacteria Archaea Eukarya Protists Plants Fungi Animals The “Universal” Tree of Life
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The Tree of Life Is a Work in Progress Archaea are more similar to eukaryotes than bacteria.
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