Unit 44 Laboratory Activity: Natural Selection
Goal: To simulate the peppermoth "evolution" as its environment channges.
You will only need the website simultation at http://www.biologycorner.com/worksheets/pepperedmoth.html.
- Read the instructions at the website.
- Select the Lichen background and click on start to start the simulation. As the bluejay, you have five minutes to consume as many moths as you can (light or dark).
- Select the Soot backgroun and rerun the simulation.
- For both runs, copy down the information on the percentage of dark and light moths that remain at the end of the simulation.
Submit the following analysis.
- Data Table
|Percent Dark Moths||Percent Light Moths|
- Explain how the color of moths increases or decreases their chances of survival depending on the environment.
- 500 light colored moths and 500 dark colored moths are released into a polluted forest. After 2 days the moths were recaptured, make a prediction about the number of each type of moth that would be captured.
- How has the striking change in coloration come about? (Include an explanation of how the dark moth appeared and how the proportion of dark moths changed from 0.0005% to more than 90% in polluted forests.)
- What underlying law of nature has produced this change? (Use Darwin's theory of evolution and apply it to what you have learned in this investigation.)
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