Section 3

Evolution in Action

• Ongoing examples of evolution among living organisms can be observed, recorded, and tested.

• In divergent evolution, related populations become less similar as they respond to different environments. Adaptive radiation is the divergent evolution of a single group of organisms in a new environment.

Vocabulary convergent evolution (p. 3G9) divergent evolution (p. 3G9)

• In convergent evolution, organisms that are not closely related resemble each other because they have responded to similar environments.

• The great variety of dog breeds is an example of artificial selection.

• The increasing occurrence of antibiotic resistance among bacteria is an example of coevolution in progress.

adaptive radiation (p. 3G9) artificial selection (p. 31G)

coevolution (p. 31G)

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