dichotomous keys lesson goal: students will be able to… recall the definition of a dichotomous key...
TRANSCRIPT
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Dichotomous Keys
Lesson Goal: Students will be able to…• Recall the definition of a dichotomous key and identify one• Describe characteristics common to dichotomous keys• Use dichotomous keys to identify objects and organisms
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Identifying Dichotomous Keys
• Animals with backbones can be divided into different groups, including mammals, reptiles, birds, amphibians and fish. List some characteristics that define each of the groups.
Animal group Characteristics MammalsReptilesBirdsAmphibiansFish
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Classifying Living Things
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Classification Systems
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Features used for classifying animals
Animal Classification Game
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Quick Quiz
• How are living organisms classified in the modern classification system?• How have microscopes dramatically changed our understanding and
classification of microbes?• Consider the case where 1 000 organisms have been divided into
dozens of groups. How could someone identify which group a particular organism belongs to?
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Keys• Have you ever used a book called a field guide to identify an
animal or plant in your local area or while on holidays? These books usually focus on a group of animals and an area or type of environment, such as ‘Birds of Southern Australia’ or ‘Desert Reptiles’.
• You usually search through the book to find a picture or description of characteristics that match the organism you have observed. The risk in using this method is that an incorrect match may be made. It can also take a long time if you have to browse through a lot pages.
Many scientists who focus on a particular group often use a key to identify the organisms. A key can be presented as a branching diagram, where the user makes a series of choices.
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Dichotomous Keys
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Definition of dichotomous keys
• As a class, individually or in groups, use the Frayer Diagram on the next slide to explore the concept of dichotomous keys.
• Click the diagram on the next slide to open a printable Frayer Diagram
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A dichotomous key is a hierarchical branching identification key that uses physical characteristic couplets to group objects or organisms.
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Homework:Use the key to identify each of the animals shown at the top of the page.