10.4 Evidence of Evolution 1 Evolutionary Time Scales Long time scale events that create and destroy species. Macroevolution: Long time scale events that create and destroy species. copyright cmassengale

10.4 Evidence of Evolution 2 Microevolution: Short time scale events (generation- to-generation) that change the genotypes and phenotypes of populations Evolutionary Time Scales copyright cmassengale

10.4 Evidence of Evolution 1. Fossils provide a record of evolution. Paleontology is the study of fossils or extinct organisms.

10.4 Evidence of Evolution Evidence for evolution Fossils in older layers are more primitive than those in the upper layers.

10.4 Evidence of Evolution Paleontology provides evidence to support evolution.

10.4 Evidence of Evolution 6 2. Geographic Distribution Different animals on different continents but similar adaptations to shared environments Different animals on different continents but similar adaptations to shared environments copyright cmassengale

10.4 Evidence of Evolution Comparative Morphology-branch of science in which the structures of living things are compared to better understand development and relationships between species 3. Embryology Larva Adult barnacle Adult crab –identical larvae, different adult body forms

10.4 Evidence of Evolution 8copyright cmassengale embryonic structures of different species show significant similarities Similar embryos, diverse organisms- embryonic structures of different species show significant similarities Human fetus- 5 weeks

10.4 Evidence of Evolution 9 ChickenTurtle Rat copyright cmassengale

10.4 Evidence of Evolution Human hand Bat wingMole foot 4. Homologous structures are similar in structure but different in function - evidence of a common ancestor.

10.4 Evidence of Evolution 11 Homologous Body Structures May Differ In Form or FunctionMay Differ In Form or Function Limb Bones Develop In Similar PatternsLimb Bones Develop In Similar Patterns Arms, Wings, Legs, Flippers copyright cmassengale

10.4 Evidence of Evolution Human hand Bat wing Mole foot Fly wing Arose from different ancestors 5. Analogous structures body parts are similar in function, but not structure (form)

10.4 Evidence of Evolution 6. Vestigial structures are remnants of organs or structures that had a function in an early ancestor. Ostrich wings

10.4 Evidence of Evolution 14 Not All Serve Important FunctionsNot All Serve Important Functions –Vestigial Organs Appendix In Man Goose bumps Legs On Skinks Muscles around ears copyright cmassengale