EXAM 1 Review

EXAM 1 Review - L111 EXAM 1 Review LECTURE TOPIC 1...

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L111 EXAM 1 Review LECTURE TOPIC 1: EVOLUTION (CH 22 all figs, concept checks, self quiz, and summary of key concepts) (CH 1, figures 1.18, 1.20, 1.21, 1.22, summary of key concepts 1.2, self quiz question 3) Charles Darwin and Evolution Evidence available to Darwin 1. Relatedness of life forms a. Vertebrate Embryos, Louis Agassiz evidence available to Darwin Haeckel Hispics: the early stage of embryos of human, chicken, salamander… early development in vertebrates is virtually identical, structural homology Inreal: gill slits and tails were present b. Vertebrate Forelimbs Richard Owen Same bones, different arrangement between species=homology Lamarck: 1- use and disuse 2-inherited acquired traits X wrong! Common ancestors Theory of Special Creation= wrong because… if all organisms were created independ, no particular patterns of life should exist 2. Changes through time a. Close relationship between fossil and existing species Fossil glypdodont and armadillo Paleontology: study of fossils (Georges Cuvier) b. Vestigial structures Rudimentary organs, incompletely developed (ex. Human appendix, coccyx, rudimentary ear muscles, fish eye socket) Whales and snakes Vestigial wings= ostrich c. Extinction Changing world Irish elk- Cuvier- extinction Giant sloth- Cuvier- convergent evolution d. Obvious changes in landforms evidence available to Darwin 1.2 vertical miles of strata mapped in grand canyon strata= layers of sedimentary rock 3. The age of the Earth evidence available to Darwin a. Rates of radioactive decay, erosion, sedimentation b. Relative dating, geologic time scale, Geologic column: mental abstraction, result of integrated individual rock layers into a single sequence Sequence of young – old fossils
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Fossils more simple=deeper in strata=older Fossils more similar and complex=close to surface=younger Chronology: time sequence Descent with modification by NS, individuals do not evolve; the pop evolves over time Radiation of related forms: Galápagos finches: similar in appearance but very different beak sizes Endler’s guppie experiment- look for spoting patterns NS, 2 months *over a relatively short period of time, evolutionary change can occur
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EXAM 1 Review - L111 EXAM 1 Review LECTURE TOPIC 1...

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