3.5.2 Dichotomous Keys, Phylogenetic Trees, & Cladograms

3.5.2 Dichotomous Keys

Classification/Taxonomy

Multiple Choice

This diagram shows a phylogenetic tree of six species based on amino acid similarities.

Which two species are the least closely related?

• V and VI

• III and IV

• I and VI

• II and III

Multiple Choice

A scientist sees the organism shown to the right in an aquarium and uses a key to help classify the species.Based on the key what species did the scientist observe?

• Aulostomus

• Gymnothorax

• Bothus

• Aetobatus

Multiple Choice

What is the purpose of using a dichotomous key?

• to identify organism

• to determine the evolutionary relationship between two organisms

• to locate the environment for each species

• to create a new kingdom