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Unformatted text preview: Lecture 3 1 1 1 Outline Outline • Darwin & Mendel • Variation Within Populations • Hardy Weinberg • Natural Selection Evolution • Don’t worry about about h 2 2 (heritability) (heritability) • THIS CHAPTER WILL BE ON THE 2nd TEST Introduction to Population Genetics Introduction to Population Genetics Chapter 4 Bio 2227 Principles of Ecology - Dr. Sanders Bio 2227 Principles of Ecology - Dr. Sanders 2 2 Population Genetics and Natural Population Genetics and Natural Selection - Chapter 8 Selection - Chapter 8 • 1835 Charles Darwin visited the Galapagos Islands and became convinced various populations evolved from ancestral form. • 1838 After reading an essay by Thomas Malthus, he theorized some individuals would have a competitive advantage conferred by favorable characteristics. 3 3 Malthus Malthus ’ Essay Essay • Plants and animals Plants and animals , and that Man also is capable of overproducing if left unchecked. • Malthus concluded that unless family size was regulated, misery of famine would become globally epidemic • Malthus thought famine and poverty were natural outcomes. 4 4 Darwin Darwin ’s Theory of Natural Selection s Theory of Natural Selection • Organisms begat like organisms. • Chance variation between individuals. • Some individuals, have a higher chance of surviving than others in the same population. Lecture 3 2 5 5 Gregor Mendel Gregor Mendel • Augustinian Monk Studied garden pea ( Pisum sativum ) and published his “laws” in 1865. (Darwin’s Theory of Natural Selection published in 1859) Discovered characteristics pass from parent to offspring Exist in alternate forms - 6 6 Darwin Darwin ’s Theory of Natural Selection s Theory of Natural Selection • Since Darwin’s and Mendel’s time, we have developed a much greater understanding of genetics and heritability • The process can now be summarized The process can now be summarized across several hierarchical levels: across several hierarchical levels: • Molecular - Molecular - • Individuals - Individuals - • Populations - Populations - 7 7 Phenotypic Variation Within Populations Phenotypic Variation Within Populations • Phenotypic variation among individuals results from • Example: Variation in Plant Populations 8 8 Variation Within Plant Populations Variation Within Plant Populations • Clausen Clausen et al....
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This note was uploaded on 03/24/2010 for the course PHYSICS 2202 taught by Professor Mihalisin during the Spring '09 term at Temple.
- Spring '09