AP Biology / Unit 7: Natural Selection
7.6 Evidence of Evolution
Notes
- Fossils and radiometric dating.
- Homologous structures (same origin, different use) and vestigial structures.
- Molecular evidence: similar DNA and protein sequences.
- Biogeography and embryology.
Practice
Human arms, whale flippers and bat wings are:
Same bones, different uses.
Two species' DNA differs by 1%; a third differs from both by 10%. The first two are:
Fewer differences, more recent ancestor.
The human appendix is an example of:
Reduced, with little function now.
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