Dichotomous Keys - PowerPoint PPT Presentation

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Dichotomous Keys

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  1. Dichotomous Keys

  2. What is a key? • We use keys in everyday life, to help us “unlock” things. • Obviously keys can be used to unlock a door, but there are other types of keys, like the ones you may find on a map that you used in geography class. These keys provide us with useful information.

  3. Dichotomous Keys • Biologists also use keys. These are keys that help them to “open doors”, that eventually lead to finding the identity of an organism. • This is really useful when dealing with organisms that have similar characteristics. • These keys are called Dichotomous keys.

  4. Dichotomous Keys • Dichotomous keys establish relationships between organisms based on shared characteristics.

  5. Dichotomous Keys • Each dichotomous key involves making a choice between two choices using if…then…logic.

  6. A Useful tool for Biologists! • When it comes to identifying organisms that look very similar, dichotomous keys make things much easier. • Lets look at how a dichotomous key can be used to identify baleen whales. Click on the whale!

  7. Dichotomous Key Activity • This activity will allow you to explore and practice using dichotomous keys. • To access this activity we will go to the Explorelearning website. • Click on enroll in a class and enter in the class code. I will give you the code. • Set up your account and launch the Gizmo. • Please complete the Gizmo and submit Activity C Parts 1 & 2.