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Unformatted text preview: Biology 1107 Lecture #39 Biology April 16, 2010 Chapter 22
Descent with Modification: A Darwinian View Descent of Life of What is science? What What is a theory? (in science) Evolution and Biology (Ernst Mayr) Francis Collins Lamarck published mechanism for evolution in 1809. use and disuse; Inheritance of acquired characteristics. Evolution was “in the air” in the late 1700’s London London London July 1837. Charles opened the first notebook on Transmutation of species Transmutation Sept. 28, 1838 Sept. Charles read Charles Malthus essay on populations. populations. This was the key for a mechanism to drive Natural Selection. Selection. Natural Selection Natural Individual variation. Individuals in a population of any species vary in many heritable traits. heritable Struggle for existence. Any
population of a species has the potential to produce far more offspring than the population can support. This overproduction makes a struggle for existence among the variant member of a population inevitable. population Differential reproductive success. Those individuals
with traits that are best suited to the local environment generally leave a disproportionately large number of surviving, fertile offspring. offspring. The reproductive success of some individuals over others means that certain heritable traits are more likely to appear in each new generation. Darwin called differential reproductive success Natural Selection, and he envisioned it Selection and as the cause of evolution. as Favorable variations variations
Insecticide resistance -passed on to offspring Favorable Variations Favor Reproduction Reproduction Successful Reproduction!! Successful Not a real struggle. Not TIME TIME
How old is the earth? When did life arise? What is the evidence for evolution? Evidences of evolution Evidences
Continental drift Fossil record Comparative anatomy Comparative embryology Molecular biology Domestication(artificial selection) Experiments Continental Drift Sedimentary Rock Fossil Formation Fossil Fossils of extinct organisms Fossils Transitional fossils Archeopterix Archeopterix Archeopterix Archeopterix ...
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