Practice: Classification using Dichotomous Keys Uh oh! Little Sammy's babysitter forgot to check for monsters under his bed when she tucked him in, and he found all of these when she left. Can you help him determine their names so he can ask them all to leave? Use the dichotomous key on the next page to help you.

A dichotomous key might be considered a useful tool to classify organisms. The key provides an easy and fast way for identification by describing different morphological and molecular traits, leading you to the correct taxonomic classification.

It is simple to read a dichotomous key. The term dichotomous refers to how information is provided. You will always have two options (a and b, or 1 and 2), and you will have to choose one of them according to the characteristics of your organism. The key describes specific morphological oir molecular traits of organisms and you need to choose between the options which ones matches the ones of your organism.

Probably you might need an atlas or a dictionary to understand some of the technical terminologies. You will also need to carefully observe your specimen, to get to distinguish different traits. If the specimen is too small you might need a loup.

Since I do not have your dichotomous key, we are going to analyze a simple example using a group of 5 organisms. We will make the classification according to the description (organisms in the attached files).

Dichotomous key

Statement 1a ----------- The organism is a vertebrate ----------- Frog

Statement 1b------------ The organism is invertebrate ----------- Go to 2

Statement 2a ---------- The organism has a multisegmented

and elongated body, with too many ----- centipede

legs.

Statement 2b ---------- The organism has a relatively short body

and with fewer legs ------------------------------ Go to 3

Statement 3a ----------- The organism has 8 legs ----------------------- Spider

Statement 3b ----------- The organism has 6 legs ----------------------- Ant

As you can see, this a very simple example, but ilustrates how the key provides enough information for you to reah the correct option.

So in your example, your dichotomous key will probably provide you information about different traits such as body-color, number of extremities, hair, and other, and you will have to observe the all your individuals and choose which trait matches each of them.

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