One of Darwin s fundamental insights regarding his proposed mechanism of evolution was that there must be genetic to act upon in a population of individuals Dr Sydney Cameron School of Integrative Biology Dept of Entomology 215 Morrill 333 2340 sacameron life uiuc edu Office hours T Th 11 00 12 00 or by appointment Fill in the blank Midterm exam II change From Th 14 April To Tu 12 April Evolution What is it The natural process es by which populations and species change over time Evolution What is it Descent with modification Darwin Origin 1859 Descent with modification 1 Cyanobacteria Evidence for Evolution Fossils indicating extinction Irish elk Apex Chert Fossils of Western Australia J W Schopf Cradle of Life 1999 Living Fossil 950 Ma Living 850 Ma Living 1 5 billion Living 2 1 billion Evidence for Evolution Fossils indicating extinction 3 5 billion yrs Fossils Law of succession Living organisms resemble the fossil forms found in the same geographic regions but differ from those in other regions Successional Forms pygmy armadillo Evidence for Evolution Wombat Fossils indicating extinction Fossils Law of succession Fossils Transitional forms Transitional fossils have some traits found in early ancestors and other traits found in the more recent descendants Fossils fig 2 6 Glyptodont Diprotodon 2 Contemporary whale Bowhead Transitional forms Microraptor gui 2003 China Transitional Forms Basilosaurus isis 38 mya 1m Ambulocetus natans 50 mya Evidence for Evolution coccyx erector pilli Vestigial organs Extra digits chicken limbs during development Fossil stingless bee in Dominican amber P roplebeia dominicana Fossils Extinction Vestigial organs Change in ecological time Common ancestry Homologous structures Change in Ecological Time Soapberry bug 1910 s 1980 s Descent with modification 3 Descent from a common ancestor Structural homologies Homologous Structures What is either or both of these scientists principally known for 1809 1882 1823 1913 F H Fig 2 1 Alfred Russel Wallace Charles Darwin 4
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