PATTERNS OF EVOLUTION Chapter 17-4

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PATTERNS OF EVOLUTION Chapter 17-4 http://www.baystatereplicas.com/images/repro_dino_pecksrex3.jpg

Large scale evolutionary patterns and processes that occur over long periods of time = ________________________ _______________________ ________________________________________ ________________________

Mass Extinctions At several times in Earth’s history large numbers of species became extinct at the same time Caused by several factors: _______________________ ________________________________________

At the end of the ____________________ Example: At the end of the ____________________ More than HALF of all plants and animals were wiped out… including the dinosaurs http://www.changbi.com/file_img/webzine/dinosaur02_02.jpg

Effects of mass extinctions: _____________ and provides opportunities for ______________species After mass extinctions there is often a ___________________ that produces many __________________ EX: Cenozoic era that followed = “____________________” Mammals species increased dramatically Image from: BIOLOGY by Miller and Levine; Prentice Hall Publishing©2006

___________________________________ When a single species or small group of species has evolved through ___________________ into diverse forms that live in different ways = ___________________________________ Ex: Galápagos finches More than a dozen species evolved from one species http://www.pbs.org/wgbh/evolution/library/01/6/image_pop/l_016_02.html

Sometimes different organisms evolution in different places or at different times but in _________________________ environments…and end up looking very similar. Process by which unrelated organisms come to resemble each other = _______________________

Example: Sharks, penguins, dolphins have all developed __________________ and appendages to move through water.

See more examples of ______________________________________ http://cas.bellarmine.edu/tietjen/Evolution/convergent_evolution_examples.htm

http://www.painetworks.com/photos/ii/ii1971.JPG The process by which two species evolve in response to changes in each other over time = __________________ See many examples of coevolution http://biology.clc.uc.edu/courses/bio303/coevolution.htm

How fast does evolution operate? Darwin believed evolution happened slowly over a long time If biological change is at a slow pace, it is called _____________. http://animals.timduru.org/dirlist/dino/FlyingDinosaurus-Pterodon-fossil.jpg

Fossil record shows evolution happens more in _______. Pattern of a long stable period interrupted by a brief period of more rapid change =____________

Rapid evolution after long periods of equilibrium can occur for several reasons: 1) Happens when a small population is ____________ from the main population OR 2) A small group ________________to a new environment (like Galápagos finches) http://www.pbs.org/wgbh/evolution/library/01/6/image_pop/l_016_02.html http://tolweb.org/tree/ToLimages/blank_map.250a.gif