Themes in biology Process of science

Themes in biology Process of science - – Specific to...

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Which theme is illustrated? #1 If you took the DNA from a bacterial cell and broke it down into the basic units, and did the same thing with your own DNA, you would not be able to distinguish between the two. #2 Ducks have webbed feet, while eagles have separate toes and sharp claws.
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Which theme is illustrated? #3 Your blood sugar level will rise and then fall some after each meal but remains relatively stable. #4 Many drought-tolerant plants have small leaves covered with hairs that prevent water lost by evaporation. #5 A spider eats a fly, then is able to build a large web the next day.
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The logic of hypothesis testing Inductive reasoning: Specific to general Example: combining observations to generate hypotheses Galileo’s breakthrough (17 th century)
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Galileo’s radical hypothesis went against “facts” that had been held for 2000 years
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The logic of hypothesis testing Inductive reasoning:
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Unformatted text preview: – Specific to general – Example: combining observations to generate hypotheses – Galileo’s breakthrough (17 th century) • Deductive reasoning: – General to specific – Examples: generating predictions So does Vitamin C really work? Generally accepted as fact if… 1. Reasonable alternatives rejected 2. Hypothesis not rejected 3. Conforms to a well-accepted theory So what is a theory? • Laws DESCRIBE • Theories EXPLAIN • Well-tested hypotheses can be combined to generate new theories Design an experiment to test the killing effectiveness of a new spray for bedbugs • Sample size • Placebo effect • Blind experiment • Control group • Controlled variables • Dependent variable A picture is worth a thousand words Correlation (not causation) Think of examples of each type of correlation Negative No correlation Positive...
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This note was uploaded on 01/05/2010 for the course BIO 101 taught by Professor Anderson during the Fall '09 term at Point Loma.

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Themes in biology Process of science - – Specific to...

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