Biology: Life on Earth
10th Edition
ISBN: 9780321729712
Author: Gerald Audesirk, Teresa Audesirk, Bruce E. Byers
Publisher: Benjamin Cummings
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Textbook Question
Chapter 15, Problem 5RQ
People like to say that “you can't prove a negative.” Study the experiment in Figure 16–3 again, and comment on what it demonstrates.
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According to this experiment, summarize it and be sure to address the following questions:
What hypothesis was being tested? How did you test your hypothesis? What independent and dependent variables were being investigated? What controls did you use? What were possible sources of error in your experiment? Please explain how the experiment you conducted supported or failed to support the original hypothesis.
Which are the most conventional type of experiment involves three major pairs of components?
The 'control group' is an essential component of an experiment. This is because
1. A control group allows one to determine if a particular result is due to the experimental variable.
2. No, it's not essential in experimentation. A control group is not always necessary it depends on the experiment.
3. A control group allows for multiple variables to be tested at the same time.
4. A control group is required for the development of a prediction.
Chapter 15 Solutions
Biology: Life on Earth
Ch. 15 - The ________ provides a simple mathematical model...Ch. 15 - 2. Different versions of the same gene are called...Ch. 15 - An organism's ________ refers to the specific...Ch. 15 - 4. A random form of evolution is called _________....Ch. 15 - Competition is most intense between members of...Ch. 15 - 6. The evolutionary fitness of an organism is...Ch. 15 - 1. What is a gene pool? How would you determine...Ch. 15 - 2. Define equilibrium population. Outline the...Ch. 15 - How does population size affect the likelihood of...Ch. 15 - If you measured the allele frequencies of a gene...
Ch. 15 - 5. People like to say that “you can’t prove a...Ch. 15 - 6. Describe the three ways in which natural...Ch. 15 - What is sexual selection? How is sexual selection...Ch. 15 - In North America, the average height of adult...Ch. 15 - Malaria is rare in North America. In populations...Ch. 15 - By the 1940s, the whooping crane population had...Ch. 15 - Prob. 4ACCh. 15 - A preview question for Chapter 16: A species is...
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- What variable is the one that you can manipulate or change? It is sometimes called experimental variablearrow_forwardIn a controlled experiment all of the variables are kept the same in order to contsistent. there is only one variable there is change for these kind of studies and it is known as variablearrow_forwardYou observe that every time your neighbor, who always wears a yellow hat, walks out his front door, he gets dive bombed by a crow. From this observation, what is a testable hypothesis? What is your prediction based on your hypothesis? Please design an experiment to test this hypothesis and prediction. You must identify the independent and dependent variables, as well as at least 2 control variables, and your experiment must contain an experimental group and a control grouparrow_forward
- Which sentence best states the importance of using control groups ? 1-Control groups go through all the steps of experiment but lack the variable being tested. 2-Control groups eliminate the need for statistical tests.Control groups eliminate the need for statistical tests. 3-Control groups allow a smaller sample size to be used, so experiments are much cheaper.arrow_forwardWhat do you call a sample that goes through all the steps of an experiment but is not exposed to the experimental variable? control group dependent variable independent variable all variables/groups are exposed to the experimental variablearrow_forwardThe null hypothesis is: That the measured value is zero That the proposed model is not correct and the measured factors have no effect on the pattern That the proposed model is correct and perfectly explains the pattern That the experiment is null and voidarrow_forward
- The more samples you have in an experiment the less accurate your data will be. True or False?arrow_forwardAn adequate sample size controls for chance events and individual variationsin response and thus enables us to place more confidence in the outcome. For example, would you rather trust your health to a drug that was tested on 5 people or one tested on 5,000? Why?arrow_forwardI am trying to figure out these four things. What is the independent variable, what is the dependent variable, what are the controlled variables and why this experiment doesn’t use a control.arrow_forward
- a) Does the data support your hypothesis? b) How could you improve this experiment? Consider the other factors you could have / should have controlled in this experiment.arrow_forwardWhat is the main idea of pseudoreplication in a manipulative experiment? Give an example problem of pseudoreplication in a manipulative experiment and explain.arrow_forwardPlease explain What are biological concepts of this experiment, limitations and improvements…Experimental techniques & the effect of the change of variables on the resultsarrow_forward
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