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Evidence for Evolution BioH Ch 18 1. 2 Petrified tree sap = amber (Basis for Jurassic Park movies)

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Presentation on theme: "Evidence for Evolution BioH Ch 18 1. 2 Petrified tree sap = amber (Basis for Jurassic Park movies)"— Presentation transcript:

1 Evidence for Evolution BioH Ch 18 1

2 2 Petrified tree sap = amber (Basis for Jurassic Park movies)

3 Fossil Evidence In 2004, scientists digging in the Canadian Arctic unearthed fossils of a half-fish, half-amphibian that all but confirmed paleontologists' theories about how land-dwelling tetrapods–four-limbed animals, including us–evolved from fish. It is a classic example of a transitional form, one that bridges a so-called evolutionary gap between different types of animal. Lets examine five important cases. 3

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9 Fossilization Lucy 9

10 Stratification 10

11 11 Evidence of evolution can lead to the formation of a timeline of development of life on Earth… Geologic Time Table Fossil records Relative Dating Radioactive dating

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13 ERAs correspond with major extinction events 13

14 Comparative Morphology Morphological divergence Homology 14 Common ancestors?

15 Morphological divergence 15

16 Morphological Convergence FishMammalBird 16

17 Ontogeny recapitulates phylogeny Embryological Evidence 17

18 Comparative Biochemistry Evidence DNA, RNA, proteins comparisons between species 18

19 Systems of Classification Visual Location Anatomical Physiological Genetic ??? Based on SIMILARITIES Easiest to identify? MOST important/ BEST relationships? 19

20 Linnaeuss System Hierarchy Seven levels - Taxons – Kingdom – Phylum – Class – Order – Family – Genus – Species 20

21 King Philip? King Philip Came Over For Good Soup Kingdom Phylum Class Order Family Genus Species 21

22 Binomial Nomenclature Genus and Species name Grizzly Bear – Ursus arctos Polar bear – Ursus maritimus Giant Panda – Ailuropoda melanoleuca 22

23 Old vs. Modern Systems Evolutionary classification (descent characteristics): Segmented bodies Jointed limbs Exoskeleton that is shed Derived characteristics = CLADOGRAM 23

24 Exercise 24

25 Taxonomy Identifying, classifying species Classification schemes Binomial system Phylogeny K-P-C-O-F-G-S 25

26 Kingdoms Archaebacteria – Ancient bacteria, unicellular, prokaryote. Found in extremely harsh environments. Eubacteria - More modern bacteria, uniclelluar, prokaryote. Common bacteria Protista – Eukaryote, unicelluar or multicellular. Autotroph or heterotroph. Pathogens and parasites. Fungi – Multicellular, eukaryote. Heterotroph. Decomposers, pathogens, parasites. Plantae - Multicellular, eukaryote. Autotrophs Animalia - Multicellular, eukaryote. Heterotroph. 26

27 Radiometric Dating Radioactive decay in everyday life 27

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30 A Changing Earth 30

31 Evidence of Change Life Fossil evidence Stratification Radiometric dating Geology Sedimentary layers Similar mineralization Aging of mountain ranges 31

32 Whats in the future? 32


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