Biology 1002 - Chapter 18 Systematics Seeking Order Amidst...

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Chapter 18 Systematics: Seeking Order Amidst Diversity Taxonomy   is the branch of biology concerned with naming and classifying the diverse  forms of life on our planet. There are many way things may be grouped: One of the early classifications placed the animals in one group and plants in  another. The bacteria, fungi, and some protests were plants while other  protests were animals Until recently, the most common taxonomic system was based on  kingdoms Now there are  3 domains o With those five kingdoms placed in the 3 different domains, the 3 domains  and the kingdoms within them each have different attributes that define  theme ( Fig 18-5) Bacteria Archaea Eukarya Animals Fungi Protists Plantae Taxonomic Categories: The organization of taxonomic grouping arranges organisms in sets. Each set is then grouped with other sets into a larger set o The major taxonomic categories from most inclusive to the least inclusive  are: Domain
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o Kingdom Phylum Class Order o Family Genus Species D     eer K ing P hil C ame O ver F or G ene's S pecial Genus: The category genus groups together closely related organisms which  may or  may not  interbreed This separation based on interbreeding defines the category species Species Biological group which includes all of the organisms which are or have the  potential for interbreeding =  biological species concept Many species were originally distinguishes by  morphology : if two organisms  looks a like, they must be the same species However, biological species are based on the ability to reproduce. What about ASEXUAL ORGANISMS? o Morphology: size, shape, structure Anatomy: organs, tissues Development: compare embryos Cell structure: chromosome number and structure (DNA) Behavior: does it fly? Swim? Quack? Lifecycle: how long does it live? How often does it reproduce? Ecology What does it eat? Where does it live? Biodiversity One thing is very clear, the more biologist look, the more species are found There are about 1.4 million identified species and possibly 5 to 50 times more  which have not been classified
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Chapter 19: The Hidden World of Microbes Microbe  – too small to be seen clearly without a microscope
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Chapter 19: The Hidden World of Microbes Prokaryotes  range in 0.2-1.0 micrometer Unicellular eukaryotes  range in size 10-100 micrometers o How big is a micrometer?
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