MAKING A DICHOTOMOUS CLASSIFICATION KEY

http://www.qacps.k12.md.us/ces/Staff2.htm

POSSIBLE“DERIVED CHARACTERS”

• All made of one material

• Is it hinged

• Has a sharp edge

• Has holes

• Hammer-like head

Hammer-like head NO Hammer-like head

Hammer-like head NO Hammer-like head

Hammer-like head NO Hammer-like head

ALL Made of Wood

NOT ALL Made of Wood

Hammer-like head NO Hammer-like head

Sides of head are different

Sides of headare NOT different

All wooden NOT all wooden

Hammer-like head NO Hammer-like head

Sides of head are different

Sides of headare NOT different

All wooden NOT all wooden? ?

Hammer-like head NO Hammer-like head

Sides of head are different

Sides of headare NOT different

All wooden NOT all wooden? ?

Hammer-like head NO Hammer-like head

Sides of head are different

Sides of headNOT different

Making a Dichotomous key

1ba

2a Sides of head different- 2b Sides NOT different-

2

Pick 2 and write officialscientific names next tofinal picture

1a Hammer-like head-1b NO hammer head-

Go to 2

ba

Go to ?

Go to ?

WHAT’S IN A NAME?

What’s in a name?

“People smart”Homo sapiens

Image from: http://www.earlylearning.ubc.ca/images/photo_baby.jpg

What’s in a name?

Bald eagleHaliaeetus leucocephalus

“sea eagle white headed”

Asterias rubens “Star red”

Image from: http://en.wikipedia.org/wiki/Image:Haliaeetus_leucocephalus-tree-USFWS.jpg

Image from: http://www.essencesonline.com/k_starfish.jpg