GIZMOs - Natural Selection (SE) Answer KEY, Rated A+ ADDED POSSIBLE QUESTIONS 100% CORRECT, SATISFACTIONS GUARANTEED 

Student Exploration

Natural Selection 1

Brandon Trigg.

Name: ______________________________________ Date: ________________________

Student Exploration: Natural Selection

Vocabulary: biological evolution, camouflage, Industrial Revolution, lichen, morph, natural

selection, peppered moth

Prior Knowledge Questions (Do these BEFORE using the Gizmo.)

The peppered moth (Biston betularia) is a common moth

found in Europe, Asia, and North America. It is commonly

found in two forms, or morphs: a dark morph and a light,

speckled morph. Birds are a frequent predator of the

peppered moth.

1. Which morph do you think would be easier to see on a

dark tree trunk? _The light colored

one______________________________

2. Which morph do you think would be easier to see on a

light tree trunk? The dark colored

one._______________________________

Gizmo Warm-up

The Natural Selection Gizmo™ allows you to play the role of

a bird feeding on peppered moths. The initial population of

40 moths is scattered over 20 tree trunks. Click on moths to

capture them. Click the Next tree button (or the spacebar

on your keyboard) to advance to the next tree.

1. Check that LIGHT TREES is selected. Click Play ( ),

and hunt moths for one year.

A. How many dark moths did you capture?

__8_____

B. How many light moths did you capture?

_0______

How many moths can you find?

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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? _The light

colored one can hide easier.___________

2. If a forest contained mostly light-colored trees, which type of moth would you expect to be

most common? __I would think the light ones would be more

common.__________________________________________________________

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? _The light ones will increase and the dark ones will

decrease._________________________________________________________________

__

2. Experiment: Click Play and hunt peppered moths on light tree trunks for five years. In each

year, try to capture as many moths as you can. Note: You can use the spacebar on your

keyboard to quickly 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 50 50

1 35 65

2 17 83

3 0 100

4 0 100

5 0 100