Descent with Modification: CHAPTER 22:. What was the philosophical consensus during the 18 th and 19 th centuries regarding Natural History and Evolution?

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Presentation transcript:

Descent with Modification: CHAPTER 22:

What was the philosophical consensus during the 18 th and 19 th centuries regarding Natural History and Evolution? EVOLUTION:

EVOLUTION HISTORY: 1. Georges Cuvier 2. James Hutton 3. Thomas Malthus 4. Jean Baptiste de Lamarck 5. Charles Lyell 6. Alfred Wallace

EVOLUTION: Additional Scientists of importance: Carolus Linnaeus- taxonomy ( ) Gregor Mendel- Inheritance (1865)

EVOLUTION Evolution? Natural Selection? Driving Force of Natural Selection?

TWO MAIN POINTS THAT COME FROM DARWIN’S “ON THE ORIGIN OF SPECIES” 1. Organisms presently inhabiting the Earth are descendants of ancestral species that were different 2. Natural selection is the mechanism for this evolutionary process

NATURAL SELECTION AND ADAPTATION: 5 observations from Ernest Mayer: 1. Exponential fertility 2. Stable population size 3. Limitation of resources 4. Varying Characteristics 5. Variation is inheritable

NATURAL SELECTION AND ADAPTATION Three inferences (Ernest Mayer): 1. Struggle for Existence 2. Non-random survival 3. Natural selection-differential success in reproduction

EVIDENCE FOR EVOLUTION: 1. Biogeography Geographical distribution of species Example: Island vs. Mainland- most island species are closely related to the nearest mainland or island

EVIDENCE FOR EVOLUTION: The Fossil Record: Supported by Biochemistry, Molecular biology, Cell biology Evolutionary transitions leave fossil evidence

EVIDENCE FOR EVOLUTION: Comparative anatomy: Anatomical Homologies Suggest common ancestor Molecular Homologies: Vestigial organs

EVIDENCE FOR EVOLUTION: Comparative Embryology : pharyngeal pouches, embryonic tails

EVIDENCE FOR EVOLUTION: Molecular Biology DNA, genes, proteins Common genetic code

FINAL POINTS ABOUT EVOLUTION AND NATURAL SELECTION: 1. Individuals do NOT evolve A population is the smallest unit that can evolve Evolution is measured as changes in a population over a succession of generations

FINAL POINTS ABOUT EVOLUTION AND NATURAL SELECTION: 2. Natural Selection can amplify or diminish only heritable traits No Lamarckian use/disuse No inherited acquired characteristics

FINAL POINTS ABOUT EVOLUTION AND NATURAL SELECTION: 3. Natural selection is always in operation, BUT the environment determines the favorability of the trait Traits can be favorable or detrimental

FINAL THOUGHT: “According to Darwin’s view, natural selection is a purposeless process but an efficacious one…..” David Quammen The Reluctant Mr. Darwin

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