Creating and Using Dichotomous Keys

The video tutorial explains how to create a dichotomous key using six pairs of shoes as an example. It outlines the process of setting up the key with one fewer step than the number of items, dividing items into two groups at each step, and following through each option until all items are keyed out. The tutorial emphasizes the importance of completing the first option before moving to the second and provides a detailed walkthrough of the steps involved.

What is the basic rule for determining the number of steps in a dichotomous key?

• The number of steps is equal to the number of items.

• The number of steps is twice the number of items.

• The number of steps is one more than the number of items.

• The number of steps is one fewer than the number of items.

In the first step of creating a dichotomous key, what is the primary task?

• To list all items alphabetically.

• To divide items into two groups based on a characteristic.

• To write a description for each item.

• To assign a unique number to each item.

When following the first option in a dichotomous key, what should you do if there are multiple items in the group?

• Create a new key for each item.

• Ignore the additional items.

• Combine all items into one category.

• Further divide the group based on another characteristic.

How are shoes with high heels further divided in the example provided?

• By the brand of the shoe.

• By the size of the shoe.

• By the type of heel and sole color.

• By color of the shoe.

What characteristic is used to divide flat shoes in the second option of the key?

• The brand of the shoe.

• The color of the shoe.

• The presence of laces.

• The material of the shoe.

What is the next step after dividing flat shoes based on laces?

• Divide them by color.

• Divide them by the presence of a swoosh.

• Divide them by size.

• Divide them by brand.

How are shoes without laces further categorized in the final steps?

• By the height of the shoe.

• By the brand of the shoe.

• By the material of the shoe.

• By the color of the shoe.

What is the key takeaway when creating a dichotomous key?

• Use as many steps as possible.

• Always start with the most complex option.

• Follow through each option completely before moving to the next.

• Ensure all items are grouped together.

What should you do if you are unclear about the process of creating a dichotomous key?

• Ask someone else to do it for you.

• Ignore the unclear parts and move on.

• Rewatch the video and practice with your own examples.

• Skip the unclear parts.

What will students work on in class after watching the video?

• Listing all possible characteristics of shoes.

• Creating a dichotomous key for their own species.

• Memorizing the steps of the key.

• Writing a report on dichotomous keys.