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Transcript
Dichotomous Keys Characteristics of Keys • “Numbered” on left • Each number has an “a” and ‘b” associated with it • Each “a” and “b” statement for one number are opposing statements about some observable characteristic of the organisms (usually not behavioral) • “Go to” directions or the identified “species name” to the rignt • There are always one fewer numbers on the left than there are species to identify General Organism Characteristics 1. Number of Cells – Unicellular or Multicellular 2. Whether they have a cell nucleus – – Prokaryotes – without nucleus Eukaryote – with a nucleus 3. Manner of acquiring energy – – Autotroph – self feeder Heterotroph – feed off others 4. Whether cell walls are present or not 5 Kingdom Dichotomous Key 1 2 3 4 A. Organism is composed of one cell (unicellular) Go to 2 B. Organism is composed of more than one cell (multicellular) Go to 3 5 Kingdom Dichotomous Key 1 2 3 4 A. Organism is composed of one cell (unicellular) Go to 2 B. Organism is composed of more than one cell (multicellular) Go to 3 A. Organism has a cell lacking a nucleus (prokaryote) K. Monera B. Organism has a cell with a nucleus (eukaryote) K. Protista 5 Kingdom Dichotomous Key 1 2 3 A. Organism is composed of one cell (unicellular) Go to 2 B. Organism is composed of more than one cell (multicellular) Go to 3 A. Organism has a cell lacking a nucleus (prokaryote) K. Monera B. Organism has a cell with a nucleus (eukaryote) K. Protista A. Organism produces it own food (autotroph) K. Plantae B. Organism has to acquire it food (heterotroph) 4 Go to 4 5 Kingdom Dichotomous Key 1 2 3 A. Organism is composed of one cell (unicellular) Go to 2 B. Organism is composed of more than one cell (multicellular) Go to 3 A. Organism has a cell lacking a nucleus (prokaryote) K. Monera B. Organism has a cell with a nucleus (eukaryote) K. Protista A. Organism produces it own food (autotroph) K. Plantae B. Organism has to acquire it food (heterotroph) 4 Go to 4 A. Organism’s cells are surrounded by cell walls K. Fungi B. Organism’s cells are not surrounded by cell walls K. Animalia