BIO311CFall09Lecture4

BIO311CFall09Lecture4 - BIO 311C Introductory Biology I...

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BIO 311C: Introductory Biology I Fall 2009 Dr. Thomas Bushart Lecture 4
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Last class Major themes I Hierarchies and emergent properties I Structure and function I Gene expression
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Why are chili peppers hot? The directed dispersal hypothesis states that capsaicin in chili peppers is an adaptation that discourages seed predation while not preventing seed dispersal The simplest alternate hypothesis is usually a null hypothesis I A null hypothesis specifies what we should observe if the hypothesis being tested doesn’t hold I Useful, but not always the best Experiments allow researchers to test the
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Elements of a Well-Designed Experiment The experiment just described is well- designed: I It included a control group (the hackberries) to check for other factors that might influence the outcome Control groups act as a point of reference I Experimental conditions were controlled to eliminate other variables I The test was repeated to reduce the effects of distortion due to small sample size
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Sampling error Getting every data point from a population is typically impossible I We can’t test every cactus mouse and thrasher in existence Scientists take samples/subsets of a population to make generalizations I Small samples, and single sampling events are prone to being different than the population
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Atoms and molecules What I expect you to review on your own:
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BIO311CFall09Lecture4 - BIO 311C Introductory Biology I...

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