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Review: taxonomy six kingdom system binomial nomenclature phylogenetic tree cladistics Nov 232:54 PM How do we classify unknowns? 'Dumbo' octopus (Grimpoteuthis sp.) What appears to be an ancient gold treasure is a magnified crustacean, a tiny copepod collected this year from the Atlantic abyss Nov 232:57 PM 1 Methods to Classify Organisms (a) Evidence from fossil records (Radioactive dating) examining the decay of carbon 14 to find the age of some organisms by comparing age they can tell if fossils were ancestors of some organisms protein comparisons of some amino acid sequences can indicate similarities or differences for example the blood proteins in horseshoe crabs reveal that it is more closely related to spiders then crabs Nov 232:56 PM Nov 248:02 AM 2 (b) Evidence from Anatomy: (Structural information) comparison of bones found in certain animals for example the human arm, horse's leg, bats wing, and whale flipper are all similar similarities of bone structure indicate the same evolutionary origin Nov 233:09 PM Nov 248:03 AM 3 (c) Evidence from Embryonic Development (Comparative Embryology) the comparison of an organisms early embryo development if organisms share common features during their embryonic stage then they may be classified together Nov 233:11 PM Nov 248:04 AM 4 (d) Evidence from Biochemistry (DNA) biochemical techniques can look at the arrangement of amino acids which form the basis of DNA for example human and baboon blood show very similar DNA patterns which suggest a close relationship between the two organisms the percentage of similarity of the DNA indicates the closeness of the relationship between the two species Nov 233:12 PM Nov 248:06 AM 5 (e) Metabolic Behavior comparison of digestion habits or the substances eaten if an organism is a producer, consumer or decomposer can also be the basis of classification Nov 233:15 PM Readings: Pages 113 119 Questions: Page 121: #'s 1,2,3,5,6,7,10,12 Nov 233:18 PM 6