This is also incorrect since dichotomous keys only focus on two traits. Answer choice (C) states that they should consider more than two characteristics at a This is incorrect because dichotomous keys are created using observable traits. This is true and seems like the correct answer, but let’s make sure and eliminate theĪnswer choice (B) states that they should avoid using morphological characteristicsĪs much as possible. Now that we understand more about dichotomous keys and how they’re used to identifyĭifferent specimens, let’s try to answer our question about how dichotomous keys canĪnswer choice (A) states that they should use common observable characteristics whenĭifferentiating between the organisms at the beginning. It’s best to start with common characteristics that are less specific, which thenīecome more specific as we work our way down the dichotomous key. This could separate mammals from other vertebrates that do not have hair, such asīirds and fish. Mammal, or it doesn’t and we’re taken to the next set of descriptions. So, in the first juncture, the vertebrate either has hair, which identifies it as a Construction and Use of Dichotomous Keys Biological keys are sets of statements that act as clues leading to the identification of an organism. These characteristics are usually contrasting, meaning that one side of the junctureĬould be the presence of a trait, while the other side is the absence of the same Remember since the prefix di- in dichotomous key means two. You’ll notice that we only focus on two characteristics at a time, which is easy to Morphological characteristics, or observable traits, such as whether they possess Then, at each juncture of the dichotomous key, we can separate our specimens by their That involves different vertebrates, which include a broad group of organisms thatĬontain a backbone. To illustrate the concept of dichotomous keys, we can talk about a theoretical one Here, the word “specimen” just means a whole or part of an organism that has beenĬollected for display or analysis. Organisms from a defined group of specimens. This question asks us about dichotomous keys which are important for identifying (C) They should consider more than two characteristics at a time. (B) They should avoid using morphological characteristics as much as possible. How could they use it correctly? (A) They should use common observable characteristics when differentiating between The key again to try to reach the correct tree.A student is going to use a dichotomous key to identify and classify organisms. If your tree doesn't match the solution, go back through Then, return to the mystery tree page to find the solution Work through the key until you reach the tree species that matches the givenĬharacteristics.
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