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Text web page activities
Chapter 13: How Populations Evolve
Darwin’s Theory of Evolution
Activity 13A: Darwin and the Galápagos Islands
1. View each of the slides and then answer the following questions:
a. How do you think the ancestors of the plants and animals on the Galapagos Islands arrived there?
b. Why are so many unique kinds of plants and animals found on island groups?
c. Does evolution occur faster on islands? Explain your answer.
2. View each of the short videos from the Galapagos tortoise to the soaring hawk.
Activity 13C Reconstructing Forelimbs
1. Sketch or cut & paste your completed forelimbs from this activity here. Make sure to label each sketch.
2. Complete and submit online the key concept quiz for this section.
POPULATION GENETICS AND THE MODERN SYNTHESIS
Activity 13D Causes of Microevolution
1. List the four causes of evolutionary change in this activity.
2. Before you begin this activity: Explain in your words the difference between the allele frequency,
genotype frequency, and phenotype frequency within any population (remember the Hardy – Weinberg
3. What are the actual frequency differences (allele, genotype, phenotype numbers) in this insect population in
this activity (use the graphs for help)?
4. How did the population change after the windstorm?
5. Explain how this demonstrates genetic drift? (was there any genetic advantage here?)
6. On slide 4 of 6 before you click on the clock observe and make a prediction about how the allele
frequencies, genotype frequencies, and phenotype numbers will change during gene flow (use the graphs,
7. How did your prediction compare to what actually happened?
8. On slide 5 of 6 before you click on the clock observe and make a prediction about how the allele
frequencies, genotype frequencies, and phenotype numbers will be affected by the mutations. (use the
graphs, give numbers).
9. How did your prediction compare to what actually happened (read the special note on this slide)?
10. On slide 6 of 6 watch the birds preying on the insects. How will predation affect the genetic structure of the
next generation and the evolution of the insects?
11. After clicking on the clock what happened to the population? How did this compare to your answer above?
12. Explain how these activities demonstrate microevolution (you may also want to look up macroevolution)?
13. View the short tubeworm video.
14. Complete and submit online the key concept quiz for this section.
Variation and Natural Selection
Activity 13E: Genetic Variation from Sexual Recombination
1. List the 3 genetic processes that lead to the most genetic variation in sexually reproducing organisms.
2. Slide 2 of 5, click on the parent cell and compare and contrast the two different outcomes for gamete
3. Explain how crossing over adds to the genetic variation of sexually reproducing organisms?
4. How are the recombinant gametes different from the parental gametes?
5. In slide 4 of 5 what is meant when they say “chromosomes lined up independently” (compare the
chromosomes in the 1st division) ?
6. How does the random nature of fertilization add to genetic variation?
7. View the 3 short videos: Snake Ritual Wrestling, Albatross Courtship Ritual, Blue-footed Boobies
courtship ritual. Complete and submit online the key concept quiz for this section.
8. Good work you are finished!