lecture1 - Biology and the "Tree of Life" An...

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An antique tapestry, showing the tree of life, that has symbolized peace, fertility, and other ideals over time. Modern biology tells us that this tree is a literal representation of the relationships among species. Biology and the “Tree of Life”
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Challenge Question Did human beings live together with the dinosaurs?
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Two Unifying Themes in Biology The Cell Theory The Theory of Evolution by Natural Selection
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The Cell Theory Cells are first described and identified – Hooke, 1665 and van Leeuwenhoek. Plant tissues composed of cells – Malphigi, 1670's Schleiden and Schwann – all organisms are composed of cells, early 1800’s
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The first view of cells: Robert Hooke’s drawing from 1665 Anton van Leeuwenhoek was the first to view single-celled “animalcules” in pond water.
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Virchow hypothesis: All cells arise from pre- existing cells (1858). Alternative hypothesis: Spontaneous
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lecture1 - Biology and the "Tree of Life" An...

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