L3 ch 23&24

L3 ch 23&24 - Lecture 3 Ch-23 24 Evolution-I A...

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Evolution-I A Historical Perspective 1600s: Empirical thought —the basis of all scientific thought; relies on observation and hypothesis Mid- to late 1600s John Ray : (English scientist) Developed a classification system for animals and plants based on anatomy and physiology. Established the notion of species that members of one species do not interbreed with members of another species. Mid- to late 1600s Carolus Linnaeus : (Swedish naturalist) Expanded and polished Ray’s work. Neither Ray nor Linnaeus proposed that evolutionary change promotes the formation of new species Late 1700s: o George Buffon (French zoologist) said that living things do change through time, but he rejected the idea that one species could evolve into another species. o Jean-Baptiste Lamarck (French naturalist) Studied fossils Hypothesized that species change over the course of many generations by adapting to new environments. Thought that organisms evolved in a continuous upward trend from simple to more complex, toward human “perfection.” Believed that organisms changed their behavior in response to environmental change and that behavioral changes modified traits and that those traits were inherited by offspring. Inheritance of acquired characteristics o Erasmus Darwin (British physician, plant biologist, and poet; Charles Darwin’s grandfather) Early advocate of evolutionary change. Was aware of how breeders used breeding practices to change the
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L3 ch 23&24 - Lecture 3 Ch-23 24 Evolution-I A...

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