Natural Selection Gizmo Answer Key 2024 [FREE PDF]

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Student Exploration NATURAL SELECTION Gizmo Answer Key – FREE ACCESS With PDF

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Vocabulary: biological evolution, camouflage, Industrial Revolution, lichen, morph, natural selection, peppered moth

Natural Selection Prior Knowledge Questions & Answers 

Q1. Which morph do you think would be easier to see on a dark tree trunk?
Ans: Light speckled morph would be easier to see on a dark tree trunk.

Q2. Which morph do you think would be easier to see on a light tree trunk?
Ans: A dark morph would be easier to see on a light tree trunk.

 

Natural Selection Gizmo Warm-Up Questions & Answers

Q1. Check that LIGHT TREES is selected. Click Play ( ), and hunt moths for one year.
Ans:
A. How many dark moths did you capture? 8
B. How many light moths did you capture? 1
C. Camouflage is coloring or patterns that help an organism blend in with the background. Which type of moth is better camouflaged on light bark? Light

Q2. If a forest contained mostly light-colored trees, which type of moth would you expect to be
most common?
Ans: Light moth

 

Natural Selection Gizmo Answer Key – Activity A

Q1. Predict: Over time, what will happen to the populations of light and dark moths on light trees?
Ans: The light moth population will thrive and increase, while the dark moths will decline and decrease.

Q2. Experiment: Click Play and hunt peppered moths on light tree trunks for five years. 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 the current populations of each moth, not the number of captured moths.)
Ans:

Year	Dark Moth	Light Moth
0	50	50
1	52	48
2	50	50
3	22	78
4	4	96
5	3	97

Q3. Analyze: What do your results show?
Ans: Over the five-year span, the percentage of dark moths decreases while the percentage of light moths increases.

Q4. Apply: Which type of moth do you think was more common before the 19th century, when most trees were light in color?
Ans: Light moths were most likely common.

Q5. Extend your thinking: What strategies did you use to hunt for moths?
Ans: I went through the trees quickly in order to make sure I got every single moth.

 

Natural Selection Gizmo Answer Key – Activity B

Q1. Predict: Over time, what will happen to the populations of light and dark moths on dark trees?
Ans: Light moths will be spotted easier and killed and their population will drop, the dark moths population will rise.

Q2. Experiment: Click Play and hunt peppered moths on dark tree trunks for five years. In each year, try to capture as many moths as you can. When you are done, select the TABLE tab and record the percentages of each moth type.
Ans:

Year	Dark Moths	Light Moths
0	50	50
1	74	26
2	100	0
3	100	0
4	100	0
5	100	0

Q3. Analyze: What do your results show?
Ans: The results show that over the five-year span, the percentage of dark moths increases while the light moths decrease.

Q4. Apply: Which type of moth do you think was more common during the 19th century? Why?
Ans: I believe that the dark moths were most likely the most common during the 19th century because they were harder to be seen on the dark trees during simulation.

Q5. Draw conclusions: Natural selection is the process by which favorable traits tend to increase in frequency over time. How does this experiment illustrate natural selection?
Ans: In each of the experiments which were conducted within this lab, the most favorable/common trait was the moth that blended and camouflaged more to the tree trunk background color. For example, when the tree trunk was dark in color, the dark-colored moths increased in frequency because they were harder to see due to the camouflage. While, when the tree trunk was light in color, the light-colored moths increased in frequency because they were harder to see due to camouflage.

Q6. Think and discuss: Did the changes you observed in the moth populations result from individual moths changing colors? Or did they occur because the best-hidden moths survived and reproduced, passing on their colors to their offspring? Explain your answer.
Ans: The changes that I observed in the moth population were not due to a result from individual moths that were changing colors. In each, the best camouflaged and well-hidden moths survived and reproduced based on the tree trunk color and whether or not they could hide within properly hidden moths based on the tree trunk color.

Q7. Extend your thinking: Biological evolution is the process by which populations of organisms change over time. How could natural selection lead to evolution? If possible, discuss your answer with your classmates and teacher.
Ans: In this lab, natural selection resulted in the moths having to change color based on reproduction. This changed the population of the moth’s overtime. This theory is called evolution. When the moths that were the same color as the tree trunk were able to survive and reproduce, the moths that were not the same color as the tree trunk died off and were not able to reproduce. This is NATURAL SELECTION.

 

Download Gizmos Student Exploration Natural Selection Answers PDF

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Basic Definitions

Above are the correct answers for the Gizmo (student exploration) topic “Natural Selection“. Now let us bring you few definitions related to this topic below:

Q. Moths
Ans: Moths are often overlooked creatures, but they’re an essential part of the global ecosystem. With more than 160,000 species of moths around the world, they play an important role in pollinating plants, as well as providing food for other animals. In this article, we’ll explore what makes moths so interesting and why they’re an integral part of a healthy environment.

Q. Lichen
Ans: Lichens are fascinating organisms that have been around for millions of years. They can be found in a variety of climates and habitats, from the polar regions to tropical rainforests. They’re an important part of nature, providing food for animals and stabilizing soils. In this article, we’ll explore what lichens are, how they form, and why they’re so important.

Q. Light Speckled Morph
Ans: The light speckled morph is a unique and beautiful species of butterfly. It has the rare ability to change its color from white to yellow, depending on the amount of sunlight it receives. This remarkable adaptation allows them to blend in with their environment and survive in diverse habitats. For many people, this butterfly is one of nature’s most exquisite creations.

Q. Dark morph
Ans: Dark morph is an interesting phenomenon in birds, where the feathers of an individual bird appear to be darker than others of the same species. It’s caused by the production of melanin, a dark pigment that gives feathers their color. This phenomenon has been observed across a variety of species, from wrens to hawks and even some seabirds. In this article, we’ll explore dark morph as it relates to bird identification and behavior in more detail.

 

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