Dichotomous Key Do Now What is a dichotomous
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Dichotomous Key Do Now: What is a dichotomous key?
Classification n When we classify species, we need a method to group these organisms into more exact groups n How do we do this?
Dichotomous Key n A key used to sort, name, and/or classify a particular organism. n This is done by working through a series of steps to identify a mystery organism.
How does this work? n Each step consists of two statements that divide things being identified into two groups. n Each statement is followed by a direction that indicates either what step to go to next or the name of the organism.
What to do n Always start at the beginning of the key! n Make sure you read exactly what the two statements are describing in order to have an accurate identification.
How to make a key n Create two statements that will divide your organisms into two groups Example: If we wanted to separate cars, jets, motorcycles, and bicycles you could start with n 1 a requires petroleum n 1 b requires on muscle power n
How to make a key n Each statement will be followed by a direction. n Example: n 1 a requires petroleum fuel go to step b n 1 b requires only muscle power bicycle
How to make your own key n You would continue to divide your groups further by two statements with two directions.
IMPORTANT n Make sure you work through step by step. n You may miss-identify the object if you skip over steps n Make sure you know what your step is asking you
