Classification and Keying p. 33

BACKGROUND

Dichotomous keys establish relationships among organisms based on shared traits, and grouping them into clades.

Each key involves making a choice between two possibilities: does the organism possess the key (trait) or not?

Note the shared trait should be something the organism has, not something it does not have.

Example for five geometrical figrures:

PROCEDURE p. 34

  • PART A - KEYING CLASSMATES

    Construct a key for 6-8 students.

  • PART B - KEYING "FISH" p. 35

    Construct a key for fish; may be helpful to know fish anatomy.

    An example incorrect key.

  • PART C - KEYING OF SHELLS

    SKIP

  • PART D - KEYING AND BIODIVERSITY p. 36

    SKIP

  • PART E - QUESTIONS

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