click below
click below
Normal Size Small Size show me how
Descent Modification
Bio IV Evo4
Term | Definition |
---|---|
descent with modification | species arise from earlier ancestors as each collects unique modifications over time |
speciation | formation of a new species when no longer can breed with related populations |
fossil | preserved evidence of organisms in rock formations |
biogeography | distribution of organisms on the planet |
comparative anatomy | comparing structures between different organisms |
homologous trait | traits that may have different functions, but inherited from a common ancestor; due to divergent evolution |
analogous trait | similar traits NOT inherited from a common ancestor; due to convergent evolution |
vestigial trait | homologous adaptation that is no longer useful in current forms |
divergent evolution | two related species splitting from a common ancestor; share homologous traits but becoming LESS similar over time |
convergent evolution | two unrelated species developing analogous traits as become more similar under similar environmental pressures |
coevolution | two species in a close relationship act as selection pressures on each other |
extinction | every member of a species has died |