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Dogs and More Dogs

Viewing Ideas

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Before Watching

  1. To help students understand the program's basic science concepts, review the following terms with them: gene, gene pool, selective pressure, mutation, species, genetic isolation, inherited trait, and acquired trait. (See Activity Answer for more information.)

  2. Ask students to cite examples of some selective pressures humans place on wildlife (e.g., encroaching into wildlife areas, altering habitats, and polluting ecosystems). What are some ways these selective pressures might impact wildlife?

  3. As students watch, have them take notes on the two explanations for the evolution of dogs: the adoption theory and the adaptation theory.

After Watching

  1. Discuss the two possible explanations for the evolution of dogs. Ask volunteers to cite reasons for each explanation. Which hypothesis do students support? Why?

  2. Have students list some reasons why scientists study genetic diseases in dogs (to develop genetic tests to identify diseases in dogs and to gain insight into human genetic diseases).

Teacher's Guide
Dogs and More Dogs
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