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Question 7 • TPS EdX Biology

How is a dichotomous key used?

Answer

Observable characteristics of the organism are checked through a sequence of two-part steps until an identification is listed in the key.

The organism is compared to paired pictures of organisms until a match is found in the key.

Observable characteristics of the organism are listed in a group and compared to different groups of observable characteristics listed in the key.

The organism’s DNA is sequenced and compared to the DNA sequences that are listed in the dichotomous key.

Explanation

A dichotomous key identifies an organism through a series of choices, with two alternatives at each step. You compare the organism’s observable traits with those alternatives and follow the matching path until the key gives an identification. It does not require DNA sequencing or matching pictures.

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