Presentation on theme: "Chapter 22: Darwin and Evolution"— Presentation transcript:
1Chapter 22: Darwin and Evolution Evolution refers to the processes that have transformed life on earth from its earliest forms to the enormous diversity that characterizes it today.Charles Darwin published On the Origin of Species by Means of Natural Selection on November 24, It was the first convincing case for evolution.
2Chapter 22: Darwin and Evolution Darwin made two major points:1. Species evolved from ancestral species and were not specially created.2. Natural selection is a mechanism that could result in this evolutionary change.
3Chapter 22: Darwin and Evolution I. A Historical Context for Evolutionary Theory.A. Western culture resisted evolutionary views of life.The Scale of Nature and Natural TheologyCuvier, fossils, and catastrophism
4Chapter 22: Darwin and Evolution I. Historical Context for Evolutionary Theory.B. Theories of geological gradualism helped clear the path for evolutionary biologists.James Hutton:GradualismCharles Lyell: Uniformitarianism
5Chapter 22: Darwin and Evolution I. Historical Context for Evolutionary Theory.C. Lamarck placed fossils in an evolutionary context.Use and disuseInheritance of acquired characteristics
6Chapter 22: Darwin and Evolution II. The Darwinian RevolutionA. Field research helped Darwin frame his view of life.The Voyage of the BeagleDarwin focuses on adaptation
7Chapter 22: Darwin and Evolution II. The Darwinian RevolutionB. The Origin of Species developed two main points: the occurrence of evolution and natural selection as its mechanism.Descent with modificationNatural selection and adaptation
8Chapter 22: Darwin and Evolution III. Evidence of EvolutionA. Evidence of evolution pervades biology.Biogeography-The geographical distribution of species.Fossil Record-It is incomplete but shows general trends in evolution.Distribution on moonjellyfish
9Chapter 22: Darwin and Evolution III. Evidence of EvolutionA. Evidence of evolution pervades biology.Comparative AnatomyHomologous structuresAnalogous structuresVestigial structures
10Chapter 22: Darwin and Evolution III. Evidence of EvolutionComparative EmbryologyMolecular Biology-DNA
11Chapter 22: Darwin and Evolution III. Evidence of EvolutionA. What is theoretical about the Darwinian view of life?