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ANIMAL CLASSIFICATION
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Carl Linnaeus 1758 Physician to King of Sweden Binomial Nomenclature named and described all that was known to Europeans Based his system on physical features and biogeography I. TAXONOMY identification and classification
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- grouped according to physical similarities - physical similarities is a result of genetics - genetics reflects common ancestry HERE’S THE REASONING
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- phylogenetic tree - shared common ancestor is a link - time is usually present Phylogeny- shows evolutionary relationships
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- time is usually present
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Creating a phylogenetic tree based on amino acid differences in hemoglobin PRACTICE EXAMPLE Organism A0 B5 C17 D8 E3 F34
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Creating a phylogenetic tree based on amino acid differences in hemoglobin PRACTICE EXAMPLE Organism A0 B5 C17 D8 E3 F34
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Do you get the same “tree” using data from anatomy and data from biochemistry? A0 B11 C45 D1 E9 F31 G21 H14
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Do you get the same “tree” using data from anatomy and data from biochemistry? MAN FUNGI DUCK RABBIT MOTH SNAKE MONKEY TUNA
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Do you get the same “tree” using data from anatomy and data from biochemistry? A0MAN B11DUCK C45FUNGI D1MONKEY E9RABBIT F31MOTH G21TUNA H14SNAKE
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PATTERNS OF EVOLUTION MORPHOLOGICAL DIVERGENCE related organisms become less similar due to different environmental circumstances. Develop features to suit their habitat MORPHOLOGICAL CONVERGENCE organisms may have similar features but are unrelated. This results from being exposed to similar environmental conditions (ex. wombat vs. ground hog )
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B. WHAT IS A SPECIES? (show powerpoint examples of hybrids) Biological - can interbreed –exceptions zedonk, tiglons, orchids, Ligers, peekapoo Morphological- members look similar to each other (be careful about convergence) cacti and euphorbia frogs species (dif. Behaviors)
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Wolf/dog hybrid
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Liger or tiglon
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Zonkey or zedonk
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Rat/squirrel hybrid
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Llamal llama/camel hybrid
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Wholphin
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Modern Species definition species- organisms that look similar and can interbreed in nature to produce fertile offspring (implies living close together)
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II. MODERN EVIDENCE (used to create groups) - comparative anatomy - cell structure - Biogeography - development "embryology" - biochemistry - paleontology - DNA
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III. The FOSSIL RECORD (HOW IS EVIDENCE EXPOSED?) Erosion Mining, digging Uplift
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III. The FOSSIL RECORD (HOW IS EVIDENCE EXPOSED?) Erosion Mining, digging Uplift
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2 IMPORTANT LOCATIONS Edia Cara Hills Australia Burgess Shale (British Columbia) Canada Classifying ancient species
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EDIA CARA HILLS (Australia) - not much on origins - 630 mybp preserved burrows and few soft bodied animals BURGESS SHALE (Canada) --570 mybp Burgess Shale in southern British Columbia -all phyla represented simultaneously?
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Ediacara Hills 630 million years ago
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SOFT BODIES
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FLATWORMS
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British Columbia, Canada
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Burgess Shale 570 million years ago
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Land Slide ! Covered large region quickly
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Fossils
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Today the sea floor is uplifted
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Why such rapid diversity? unpopulated world with many niches available organics in water provided food for early animals pliable genome (genetic base) many variants are created and survive
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Where does this occur today? in locations like ???? Extinct volcanoes, islands, thermal vents, Death Valley (oasis)
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Or… Mass extinctions- opportunities for ADAPATIVE RADIATION Variations already exist in the phyla Burst of rapid evolution of a lineage, resulting in formation of new species in a wide range of habitats
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The Rate of Evolution Gradualism-(Darwin) small changes accumulate over a long period of time. (Transitional fossils would be expected) Punctuated Equilibrium- (Stephen J. Gould) long periods of uneventful time passes until a catastrophe creates opportunities for new species to flourish. Little change is punctuated by rapid evolution of new species.
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QUIZ TOPICS Evaluate or create a phylogenetic tree Taxonomic hierarchy Significance of Edia Cara Hills and Burgess Shale
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