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Unformatted text preview: C HAPTER HAPTER 26: P 26: P HYLOGENY HYLOGENY AND AND THE THE T T REE REE OF OF L L IFE IFE F ROM T WO K INGDOMS TO T HREE D OMAINS-2 Kingdoms: plants and animals plants: bacteria, fungi animals: protozoans-5 Kingdoms: monera, protista, animalia, fungi, plantae-prokaryotic and eukaryotic-problem: some prokaryotes are as different from each other than they are to eukaryotes-3 Domain system above Kingdoms: Bacteria, Archaea, Eukarya-bacteria: most of the currently known prokaryotes-archaea: diverse group of prokaryotic organisms that inhabit a wide variety of environments -eukarya: all eukaryotes (single-celled, multicellular)-3 Domain system: much of the history of life has been about single-celled organisms-monera and protista not very considered anymore because can’t be in more than 1 domain-protista doesn’t exist because it is POLYPHYLETIC : (descended from different ancestors) members that are more closely related to plants, fungi, or animals than to other protists / pertaining to a group of taxa derived from 2 or more different ancestors A S IMPLE T REE OF A LL L IFE-Simpler tree: first major split in life occurred when bacteria diverged from other organisms-eukaryotes and archae are more closely related than either is to bacteria- COMPARISONS OF R RNA genes: code for the RNA parts of a ribosome-ribosomes are fundamental rRNA evolved very slowly that homologies between distantly related organisms can still be detected, making genes very useful for determining evolutionary relationships among deep branches in the history of life...
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- Fall '10
- Bacteria, 3 hours, nucleoid, LIPOPOLYSACCHARDIES, GENOMIC ORGANIZATION, currently known prokaryotes