BIOL211#18 - Chapter 23 Evolution An Introduction to...

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1 Chapter 23 An Introduction to Evolution Evolution – A heritable change in one or more characteristics of a population from one generation to the next Microevolution Macroevolution Species – A group of related organisms that share a distinctive form – In species that reproduce sexually, members of the same species are capable of interbreeding in nature to produce viable and fertile offspring Population – All members of a species that live in the same area and have the opportunity to interbreed – A population is the smallest unit that can evolve The Theory of Evolution A new era of biology began on November 24, 1859 On that day, Charles Darwin published On the Origin of Species by Means of Natural Selection Charles Darwin 1809 - 1882 The Origin of Species focused biologists’ attention on the great diversity of organisms and ushered in the era of evolutionary biology
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2 The Origin of Species – Shook the deepest roots of Western culture – Challenged a worldview that had been prevalent for centuries The Greek philosopher Aristotle viewed species as fixed and unchanging These ideas coincided with the Old Testament account of creation which holds that species were individually designed by God and therefore perfect John Ray – First scientist to carry out a thorough study of the living world – Developed an early classification system – Established the modern concept of a species – Did not advocate evolutionary change Carolus Linnaeus
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BIOL211#18 - Chapter 23 Evolution An Introduction to...

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