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Embed code for: Biology 1- Intro Scientific Method
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Introduction to Scientific Method
Overview of Steps
Gather Information (Observation/Literature Review)
Define the Question
Perform Experiment and Collect Data
Ask a Question
5. Analyze Data
6. Interpret Results
7. Draw Conclusions
Conclusion: A horse at a running gallop does have all four hooves off the ground at some point.
Belief Based on Prior Observations
Idea of Spontaneous Generation
If bale of hay left in barn it produces mice
Muddy soil gives rise to frogs
Meat hung out in the market was the source of flies
Francesco Redi – 1668
Hypothesized: Flies produce maggots
How could he test this?
Through a controlled experiment
Used two groups of jars
Jars that contained meat and no cover
Jars that contained meat and gauze cover
Independent Variable: purposely manipulated
Gauze covering that keeps flies away from meat
Dependent Variable: being observed; changes in response to independent variable
Presence of maggots
Controlled Variables: purposely kept constant
- Jars, type of meat, location, temperature, time
Variables in Redi’s Experiment
OBSERVATIONS: Flies land on meat that is left uncovered. Later, maggots appear on the meat.
HYPOTHESIS: Flies produce maggots.
jars, type of meat,
gauze covering that
keeps flies away from
No maggots appear
CONCLUSION: Maggots form only when flies come in contact with meat. Spontaneous generation of maggots did not occur.