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Study Guide UNIT VIII Accelerated Honors Biology Know Darwin’s Ideas on Evolution: Evolution-unifying theme/response to current environment Species change over time Natural selection Descent with modification-how modern species arose over time, from earlier life forms Artificial selection- wild mustard Lamarck’s idea-acquire a trait in ones lifetime because of need & pass that trait to offspring Definition of Natural Selection- Differential reproduction Success Evidence supporting evolution: o Comparative embryology o Molecular biology o Biogeography-distribution of living species o Comparative anatomy: o Define: Homologous structure: wing of bat, whale flipper Vestigial structures-appendix Homology indicates patterns of descent shown on an evolutionary tree Define population/specie; pop. Smallest unit to evolve Gene pool Mutations- ultimate source of new alleles-genes Microevolution-causes of evolutionary change o Natural selection o Genetic drift- change in gene pool of population- usually from a disaster Bottleneck effect Founder effect o Gene flow Stabilizing selection Directional selection Disruptive selection Sexual selection –sexual dimorphism peacock, peahen Examples of Evolution today: Antibiotic resistant bacteria Earliest fossil;-what fossils found in which strata radiometric dating-