SME
Principles of Biology II
Evolution
Use this for “Are a bat’s wing and a whale’s flipper homologous or analogous, and what is a whale’s pelvis evidence of?”
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What kind of evidence for evolution does each structure show?
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Homologous parts share an ancestor’s plan; analogous parts share a job.
Assumptions
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Homologous structures have the same bones in the same order, inherited from a common ancestor, even when they do different jobs.
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Analogous structures do the same job with a different build; they evolved separately and show no shared plan.
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A vestigial structure is a reduced part with little or no use, left over from an ancestor that used it.
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