Directions for Gizmo:
A. Open the following in a New Window or New Tab:
B. Use the following username: secondp112
C. Scroll Down to “Leave a Comment” and right-click to Open in New Tab
D. Proceed to answer questions below.
1. Check that LIGHT TREES is selected. Click Start and hunt moths for one year.
A. How many dark moths did you capture? _______
B. How many light moths did you capture? _______
C. Camouflage is coloring or patterns that help an organism to blend in with the background. Which type of moth is better camouflaged on light bark? ____________
2. If a forest contained mostly light-colored trees, which type of moth would you expect to be most common? ____________________________________________________________
How many moths can you find?
Activity A: Light trees Get the Gizmo ready: • Click Reset. • Check that the LIGHT TREES tab is selected. Introduction: Before the 19th century in England, the air was very clean. The bark on trees was usually light in color. Abundant lichens growing on tree trunks also lightened their appearance.
Question: How does the color of a peppered moth affect survival?
1. Predict: Over time, what will to happen to the populations of light and dark moths on light trees? ____________________________________________________________________ 2.
Experiment: Click Start and hunt peppered moths on light tree trunks for five years. In each year, try to capture as many moths as you can. (Hint: Use the spacebar on your keyboard to advance to the next tree.) After 5 years, select the TABLE tab and record the percentages of each moth type. (Note: The table shows current populations of each moth, not the number of captured moths.)
Year Dark moths Light moths 0 1 2 3 4 5
3. Analyze: What do your results show? ___________________________________________ _________________________________________________________________________4. Apply: Which type of moth do you think was more common before the 19th century, when most trees were light in color? _________________________________________________
5. Extend your thinking: What strategies did you use to hunt for moths?