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