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Refer to this portion of a dichotomous key to answer the question.

1. (a) Has a single dorsal fin ® 5 (b) Has a double dorsal fin ® 2
5. (a) Has a small fin on back near tail ® 6 (b) Has no fin on back near tail ® 7 6. (
a) Has barbs near the mouth ® Catfish (b) Does not have barbs near the mouth ® 10
7. (a) Tail is asymmetrical ® Sturgeon (b) Tail is symmetrical ® 8

What would the result be when identifying a fish with a single dorsal fin, no fin on its back near the tail, and a tail that is asymmetrical?

Respuesta :

ysalgueror

Answer:

We can conclude that the fish is Sturgeon.  

Explanation:

We need to identify the result of a fish with a single dorsal fin, no fin on its back near the tail, and an asymmetrical tail.

The problem mentions the following dichotomous key:

1. (a) Has a single dorsal fin ® 5 (b) Has a double dorsal fin ® 2

5. (a) Has a small fin on back near tail ® 6 (b) Has no fin on back near tail ® 7 6. (

a) Has barbs near the mouth ® Catfish (b) Does not have barbs near the mouth ® 10

7. (a) Tail is asymmetrical ® Sturgeon (b) Tail is symmetrical ® 8

In the first step, the fish we need to study has a single dorsal fin. According to the key number 1. (a) Has a single dorsal fin ® 5 We should go to five-step.

After that, we know that this fish has no fin on the back. Taking into account key number 5. (a) Has a small fin on the back near tail ® 6 (b) Has no fin on the back near tail ® 7 We should go to number seven.

The last information we have about this fish is that it has a tail asymmetrical. 7. (a) Tail is asymmetrical ® Sturgeon. As the final result, we can conclude that the fish is Sturgeon.

Finally, we can conclude that the fish is Sturgeon.  

marianaegarciaperedo

A dichotomous key is an identification tool used to know the taxonomic group to which an organism belongs. In the exposed example, the fish is Sturgeon.

What is a Dichotomous key?

  • A dichotomous key might be considered a significantly useful tool to classify or identify organisms.

  • When you have an organism -or part of it-, and you need to identify it taxonomically, you use the dichotomous key.

  • The key provides morphological descriptions about different taxonomic groups in an easy way to identify these traits in your individual.

How to read a dichotomous key? Correct identification

  • 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 two alternatives of the same trait. For instance, the trait number one is skin color, which might be either (a) green or (b) white. And you need observe your organism and say if it has green or white skin.

  • The key describes specific morphological traits of organisms that are useful for differentiation.

  • The key leads you to the correct answer. Once you have chosen one of the options, it leads you to the following trait. For instance, if your organism has green skin, the key tells you to move to trait number 5, which describes two alternatives of eyes number. But if your organism has white skin, the key tells you to move to trait number 3 which describe legs number. And so on until you get to the taxonomic group of the organism.

Extra Material

  • 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.

Now, let us analyze the given portion of a dichotomous key. The number s 1 to 7 are the described traits, the two options are (a) and (b).

1. (a) Has a single dorsal fin ---------------------------------® 5

  (b) Has a double dorsal fin -------------------------------® 2

5. (a) Has a small fin on back near tail ------------------® 6

   (b) Has no fin on back near tail ------------------------® 7.

6. (a) Has barbs near the mouth ---------------------------® Catfish

   (b) Does not have barbs near the mouth ------------® 10

7. (a) Tail is asymmetrical ------------------------------------® Sturgeon

   (b) Tail is symmetrical --------------------------------------® 8

The characteristics of your fish are the followings:  

  • a single dorsal fin,
  • no fin on its back near the tail, and
  • a tail that is asymmetrical

Let us analyze trait by trait.

⇒ Dorsal fin (Trait number 1)

  • The key provides two options: single dorsal fin or double dorsal fin.
  • Your fish has a single dorsal fin, so you choose option (a), which leads you to trait number ® 5.

⇒ The Fin on the back near tail (Trait number 5)

  • The key provides two options: small fin or no fin near tail.
  • Your fish has no fin on its back near the tail, so you choose option (b), which leads you to trait number ® 7.

⇒ Tail symmetry (Trait number 7)

  • The key provides two options: asymmetrical or symmetrical.
  • Your fish has an asymmetrical tail, so you choose option (a)
  • The key tells you that your organism is a Sturgeon fish.

According to the described traits, The fish is a Sturgeon.  

You can learn more about dichotomous keys at

https://brainly.com/question/1281957

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