Dichotomous Key Creation and Use

This video tutorial explains dichotomous keys, tools used to classify organisms based on observable traits. It covers the rules for creating these keys, including having one less question than the number of organisms. Two types of keys are discussed: linear and tree diagram. Examples using fictional aliens and minions illustrate how to apply these keys in practice.

What is the primary purpose of a dichotomous key?

• To classify organisms based on their observable traits

• To identify the habitat of organisms

• To classify organisms based on their genetic traits

• To determine the age of organisms

How many questions should a dichotomous key have compared to the number of organisms?

• Equal to the number of organisms

• One more than the number of organisms

• Twice the number of organisms

• One less than the number of organisms

What is the correct format for writing the scientific name of an organism?

• Genus and species both capitalized

• Genus capitalized, species lowercase

• Both genus and species in lowercase

• Genus lowercase, species capitalized

In a linearly arranged dichotomous key, what happens after selecting a description?

• The organism is immediately identified

• The classifier must start over

• The classifier is led to another pair of descriptors

• The process ends

What is a key feature of the tree diagram type of dichotomous key?

• It uses a linear list of questions

• It is preferred by most students

• It requires more questions than organisms

• It is less visual than the linear type

When creating a dichotomous key with minions, what is the first question asked?

• Is the minion tall?

• Does the minion have two eyes?

• Is the minion clasping its hands?

• Is the minion blinking?

How many classifying questions are needed for eight minions?

• Six

• Eight

• Seven

• Nine

What is the next question after determining if a minion has two eyes?

• Does the minion have arms?

• Is the minion blinking?

• Is the minion tall?

• Does the minion have fur?

What is the final step in creating a dichotomous key?

• Starting the process over

• Classifying the remaining organisms

• Naming the organisms

• Double-checking the number of questions

What is the significance of the number of questions in a dichotomous key?

• It should be one more than the number of organisms

• It should be twice the number of organisms

• It should be equal to the number of organisms

• It should be one less than the number of organisms