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Dogs and More Dogs
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Viewing Ideas
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Before Watching
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.)
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?
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
Discuss the two possible explanations for the evolution of dogs. Ask volunteers
to cite reasons for each explanation. Which hypothesis do students support?
Why?
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).
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