7 BIOL 1001 Evidence for Evolution (Jan. 21) post-lect

C an ancestral organism that has no dis nguishing

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Unformatted text preview:  Life on Earth has changed over -me • Different species share common ancestors A phylogeny is a hypothesis – constantly tested & re- evaluated These are all phylogenies http://evolution.berkeley.edu/evolibrary/article/0_0_0/evo_02 A common ancestor is A.  an ancestral organism very commonly seen in the fossil record. B.  an ancestral organism shared by two or more descendant organisms. C.  an ancestral organism that has no dis-nguishing features and thus is very common – it is not unique. D.  none of the above. Evolu-on – the unity & diversity of life A phylogeny is a hypothesis – constantly tested & re- evaluated http://evolution.berkeley.edu/evolibrary/article/0_0_0/evo_02 Evolu-on – the unity & diversity of life http://evolution.berkeley.edu/evolibrary/article/0_0_0/evo_02 Evidence for Evolu-on Evidence spp change through 2me: • Fossils à༎ ex-nc-on; ex-nct spp resembling extant spp à༎ transi-onal fossils • Evidence of living spp changing over -me • E.g., insec-cide resistance, an-bio-c resistance Evidence common ancestry (descent with modifica2on): • Fossils à༎ transi-onal fossils • Ves-gial traits (extant spp) • Ar-ficial selec-on • Biogeography • Homology (both ex-nct & extant spp) Spp = species • Structural, developmental, gene-c (compara-ve anatomy, embryology & DNA analysis; includes ves-gial traits) 56 Evidence for Evolu-on Evidence: species change through -me EXTINCTION sils Fos 500 mya 3.6 bya Choose the best defini-on of a fossil: A.  Any trace of an organism that has been converted into rock. B....
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