Bio1_21_EvolutionI - 1 2 3 4 5 6 1 2 7 Overview...

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1 Overview: Microevolution – Historical perspective – Natural selection – Evidence for evolution • Ch. 16: How Populations Evolve – Population genetics •Hardy-Weinberg principle •Microevolution Evidence for Change: 1700s • Carolus Linnaeus – Binomial system of nomenclature – System of classification for organisms • Count Buffon (Georges-Louis Leclerc) – Evidence for decent with modification • Erasmus Darwin (Charles’ grandfather) – Evidence for common descent – E.g., vestigial structures Evidence for Change: 1800s • Baron Georges Cuvier – System for classifying animals – Founder of paleontology – Obsolete concept: catastrophism • Jean-Baptiste Lamarck – More complex organisms descended from less complex organisms – Obsolete concept: inheritance of acquired characteristics Evidence for Change: 1800s Geology – Gradual molding of Earth’s geologic structure – Obsolete concept: uniformitarianism Population growth (Malthus) – As a population outgrows resources, members compete; some do not survive Variation in populations (Darwin) – Members of a population exhibit variation in traits Voyage of the Beagle Darwin’s Observations • Biogeography – Study of distributions of organisms • Darwin’s observations – Patagonian hare •Adaptations similar to European hare – Galápagos tortoises – Finches – Marine iguana Natural Selection • Developing the idea of natural selection 1)Obs: All populations can in # 2)Obs: No population can indefinitely 3)Inf: Members must compete for resources 4)Obs: Individuals have different versions of the same traits 5)Obs: These traits are heritable 1 2 3 4 5 6 1 2 7
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2 6)Inf: Adaptive traits in frequency 7)Concl: Populations can evolve by natural selection Natural Selection • Key components of the process: – Inheritable variation in populations •Variation is necessary for adaptation – Overproduction causes competition for resources
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This note was uploaded on 01/12/2012 for the course BIOLOGY 1 taught by Professor Teresafinnern during the Fall '11 term at Riverside Community College.

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Bio1_21_EvolutionI - 1 2 3 4 5 6 1 2 7 Overview...

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