Shown the figure the founder effect
THINK ABOUT IT
Factors such as natural selection and genetic drift can change the relative frequencies of alleles in a population, but this alone does not lead to development of a new species.
Isolating Mechanisms
including behavioral isolation, geographic isolation, and temporal isolation.
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| What did the Grants’ scientific investigation show about Galápagos finches? The Grants documented that natural selection takes place frequently—and |
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sometimes rapidly.
The Grants’ work also shows that variation within a species increases the
Testing Natural Selection in Nature
Darwin hypothesized that the Galápagos finches had descended from a common ancestor.
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A Testable Hypothesis
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likelihood that the species can adapt and survive environmental change.
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