Evolution Video Clips

Evolution Video clips Part 2 Name______

http://www.pbs.org/wgbh/evolution/educators/teachstuds/svideos.html

How does evolution work?

1. What are the four components of natural selection?

2. What determines an individual hummingbird’s beak length?

3. What factors in the environment might select for beak length and shape within hummingbird populations?

4. How can hummingbird DNA help Dr. Schneider determine the evolutionary history of hummingbirds?

Why Does Evolution Matter Now?

1.  How does the misuse of antibiotics affect the evolution of disease-causing bacteria like TB? Describe in terms of natural selection.

2.  What is responsible for the evolution of TB strains that are resistant to multiple drugs?

3.  Why is the Russian prison system considered to be “ground-zero” in the fight against TB?

4.  How does globalization affect the transmission of disease? Give an example that includes the way TB is transmitted.