# Virtual population lab activity answer key. Population Dynamics

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## Virtual Lab: Population Biology

. Model 1 — PopGen Fish Pond This model is an agent-based population genetics simulation. LabBench Activity Population Genetics and Evolution by Theresa Knapp Holtzclaw Introduction The Hardy-Weinberg law of genetic equilibrium provides a mathematical model for studying evolutionary changes in allelic frequency within a population. Students can set multiple model parameters, such as starting population size, time, and carrying capacity, and observe how population growth is affected by changing any of these variables. Based upon your data, which culture experienced the greatest rate of exponential growth? You can adjust the mainland population size and put it through a bottleneck. A genetic variant of the original population began to experience growth due to its use of a different food bacterium source d.

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## Virtual Lab: Population Biology

Pearson, as an active contributor to the biology learning community, is pleased to provide free access to the Classic edition of The Biology Place to all educators and their students. Some of the material will extend your knowledge beyond your classwork or textbook reading. This will open up your workspace for observing the cultures. The population size and the initial allele proportion can be manipulated. Nothing, they are photosynthetic 4. Instructions: This lab has instructions on the left hand side and also contains pages to enter data and questions.

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## Pearson

Models in this section explore various mechanisms that affect allele proportions in populations. Print this out for copies, or use the to type directly into the tables preferred Data Table P. In a repeat of this experiment, you found that on Days 10-16 the number of individuals in the P. Also, you can colonize two islands off of the coast of the mainland with a random subset of the mainland population. To make your wetmount preparations, click the box of clean slides and then the rack of cultures. In the model, ten vials populations of flies are held at a constant population size and the proportions of a mutant allele are tracked over generations. Explain how this experiment demonstrates that no two species can occupy the same niche.

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## Virtual Lab: Population Biology

Directions and background information are embedded in the model exercise. The organisms used in this experiment belong to which domain of life? Three incompletely dominant alleles exist in the simulated population red, yellow, blue with heterozygous individuals appearing as the blending of the two alleles. The logistic growth model describes how a population changes if there is an upper limit to its growth. You are now ready to repeat the actions in step 4. At the end of each activity, you can assess your progress through a Self-Quiz.

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## Solved: Virtual Lab: Population Biology Post

None of the above could lead to this scenario. This interactive simulation allows students to explore two classic mathematical models that describe how populations change over time: the exponential and logistic growth models. Start by clicking on the purple pipette bulb on the far left. Describe what happened when the Paramecium populations were mixed in the same test tube. Model 3 — Random Genetic Drift This model is an adaptation of the classic experiment conducted by Peter Buri 1956 , which documented genetic drift in laboratory populations of Drosophila. Once filled, click and drag the pipette to the test tube on the far left of the test tube rack in order to fill it with the first protist culture. You will next need to click on the microscope icon in the laboratory area.

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## Virtual Lab: Population Biology

Based upon the data, which organism appeared more efficient at using its resources? What does this tell you about how Paramecium aurelia uses available resources? Explain how you tested your hypothesis. In fact, biological evolution is now defined as: changes in allele proportions within a population over time. Model 2 — Random Genetic Effects This model illustrates random genetic drift, bottleneck effects, and founder effects. Remember to multiply your counts by 2 to indicate the number of organisms present in 1mL of culture. This model can be applied to populations that are limited by food, space, competition, and other density-dependent factors. A possible explanation for this is: a.

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## Solved: Virtual Lab: Population Biology Post

The exponential growth model describes how a population changes if its growth is unlimited. Make a hypothesis about how you think the two species of Paramecium will grow alone and how they will grow when they are grown together. There would be no competition, they are of the same species 6. To begin, click on an activity title. You can then click each individual slide and drag it to the microscope in order to count the organisms in each culture.

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## Solved: Virtual Lab: Population Biology Post

There was insufficient food in the culture b. In this laboratory, you will apply this model by using your class as a sample population. On what day did the Paramecium caudatum population reach the carrying capacity of the environment when it was grown alone? Which type of competition would be observed between organisms within the P. Then click on the bulb on the right and repeat the steps to fill the second test tube with the next culture. The concentration of organisms in this culture is: a.

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