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Download 2/19/13 Evidence for Evolution
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Evidence for Evolution Evidence for Evolution Adaptations: changes in a species that occur over a long period of time that make a species more successful in an ecosystem Darwin’s Evidence for Evolution Fossil Record By comparing fossils from older rock layers to fossils from newer rock layers, scientists can document that life on earth has changed. Fossils Darwin’s Evidence of Evolution Homologous Body Structures Features with a common evolutionary origin similar in arrangement and/or function. Darwin’s Evidence of Evolution Analogous Structures: Have similar arrangement and/or function but do not have a common evolutionary origin. Evidence for Evolution Vestigial organs: Organ that doesn’t serve a useful function anymore The presence of these organs may not affect the organism’s ability to survive Natural selection will not eliminate that organ Examples of Vestigial Structures Wings on flightless birds Eyes on blind fish The human appendix Hind leg bones on whales http://www.pbs.org/wgbh/ev olution/library/03/4/l_034_0 5.html Darwin’s Evidence of Evolution Similarities in Embryology Embryos of many animals with a backbone are very similar The same group of embryonic cells develop in the same order and patterns in all vertebrate http://www.pbs.org/wgbh/evolution/library/04/2/l_042_02.html BIOCHEMISTRY By comparing DNA and RNA of different species, we can determine their relationships http://www.pbs.org/wgbh/evolution/library/11/2/e_s_5.html