Dichotomous keys
establish relationships among organisms based on shared traits.

Each dichotomous
key involves making a choice between **two** possibilities using if ... then ... logic.

An example with MendAliens, using a diagram representing clades.

**PART A - KEYING PETS**`p. 64`Dog, cat, parakeet, goldfish, rabbit: key:

- fins
- feathers
- canines
- muzzle

- Construct a key for your favorite pet.
(Data sheet
`p. 67`).

**PART B - KEYING CLASSMATES**Construct a key for 6-8 students.

**PART C - KEYING "FISH"**`p. 65`Construct a key for fish; may be helpful to know fish anatomy.

An example incorrect key.

**PART D - KEYING AND BIODIVERSITY**`p. 66`SKIP

**PART E - QUESTIONS**`p. 70`- Construct another different key for the 5 pets.

SKIP #3, #4

Home | ^{©} |