bionotestakeninclassfromslides - Eukaryotic Multicellular...

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1/25/2010 Problems w species concepts - Convergent evolution - Molecules vs morphology - Cryptic species - Ring species Some of these criteria can be misleading because very different organisms can have similar characteristics or homology. Sharks v dolphins. In addition, the more closely related two organisms are, the smaller the differences between them. This often means very small anatomical differences re used to distinguish between two species. Until recently the most commonly used taxonomic system, proposed in 1969 by Robert Whittaker, had as its largest grouping five kingdoms . These five kingdoms each had observably different attributes that defined them. The five kingdoms and their defining characteristics: Kingdom Cell Cell Nutritional Type Number Method Monera Prokaryotic Unicellular Absorption/photosynthesis Protista Eukaryotic Unicellular Absorption/photosyn./ingestion Fungi Eukaryotic Multicellular Absorption Plantae Eukaryotic Multicellular Photosynthesis
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Unformatted text preview: Eukaryotic Multicellular Ingestion The major taxonomic categories from most inclusive (biggest set) to least inclusive (smallest set) are: Domain, Kingdome, Phylum/Division, Class, Order, Family, Genus, Species Many species were originally distinguished by morphology. If 2 organisms look alike, they must be the same species. However, biological species are based on the ability to reproduce. The techniques of molecular biology have aided the taxonomist in the classification of organisms by allowing the DNA sequences from two organisms to be compared. (see scientific inquiery page 350) The ability to examine the DNA sequences and genes of different organisms resulted in the kingdom Monera being separated into two distinct groups. Carl Woese proposed that these two groups of bacteria are as different form each other as they are from the eukaryotes and that these differences arose very early in the process of evolution....
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This note was uploaded on 10/01/2010 for the course BIOL 1002 taught by Professor Pomarico during the Spring '08 term at LSU.

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bionotestakeninclassfromslides - Eukaryotic Multicellular...

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