Biology Unit 7 Lesson 2 Natural Selection Over Time Quick Check Answers
1. Which statement is true?
Answer - Epigenetic changes cannot be explained by DNA structure, but genetic changes can.
2. Which animal trait was Darwin’s theory of natural selection based on?
Answer - beak morphology of Galápagos finches
3. What is most likely to happen if predators are introduced to an ecosystem with no known predators?
Answer - A decrease in species abundance.
4. Which representation of data visualizes potential relationships between variables?
Answer - a graph
5. How did Drs. Peter and Mary Grant verify Darwin’s theory of natural selection?
Answer - by making observations over a long period of time
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Good job on answering the questions correctly! Here's how you can arrive at the answers yourself:
1. To answer this question, you need to understand the difference between epigenetic changes and genetic changes. Epigenetic changes refer to modifications in gene expression without changes in the DNA sequence, while genetic changes involve alterations in the DNA sequence itself. Knowing this, you can eliminate any statements that mistakenly describe genetic changes or claim that epigenetic changes cannot be explained by DNA structure. The correct answer is the one that correctly states that genetic changes can be explained by DNA structure, but epigenetic changes cannot.
2. The question is asking about the animal trait on which Darwin's theory of natural selection was based. To answer this, you need to be familiar with Darwin's research on the Galápagos finches. Darwin observed that these finches had different beak morphologies that allowed them to adapt to different food sources on the islands. This variation in beak morphology and its relationship to food availability formed a crucial part of Darwin's theory of natural selection. Therefore, the correct answer is the beak morphology of Galápagos finches.
3. This question requires you to understand the impact of the introduction of predators to an ecosystem without known predators. When predators are introduced to an ecosystem with no known predators, it disrupts the existing balance and can lead to a decrease in the abundance of certain species. The presence of predators can result in increased predation pressure, leading to decreased population sizes of prey species. Therefore, the most likely result of introducing predators to an ecosystem with no known predators is a decrease in species abundance.
4. To answer this question, you need to understand what data visualization method can represent potential relationships between variables. A graph is an effective way to visualize data and can help identify potential relationships between variables. Graphs allow you to plot different variables on different axes and analyze how changes in one variable affect another. Therefore, the correct answer is a graph.
5. This question tests your knowledge of how Drs. Peter and Mary Grant verified Darwin's theory of natural selection. The Grants conducted long-term field studies on Galápagos finches and made observations over an extended period to gather evidence that supports Darwin's theory. By carefully documenting changes in the finches' beak morphology and survival rates over time, their research provided evidence for natural selection in action. Therefore, the correct answer is that they verified Darwin's theory by making observations over a long period of time.
Remember, understanding the concepts and being familiar with the subject material will help you arrive at the correct answers. Good luck with your studies!