Exercise 1- Dichotomous Key Practice A dichotomous key is an

26 Jun Exercise 1- Dichotomous Key Practice A dichotomous key is an

Question
Exercise 1: Dichotomous Key Practice
.jpg”>A dichotomous key is an identification tool that starts with broad defining characteristics and splits into two options until an organism can be identified. In this exercise, you will identify organisms by their binomial nomenclature using a dichotomous key.

Materials

Dichotomous Key

Images of Organisms

Procedure

Start by observing organism i (Figure 2). Once you have taken notice of its physical characteristics, use the dichotomous key (Figure 3) to identify the organism.
Start at number 1 on the key and decide if the organism has feature “1a” or feature “1b”.
Which ever option you choose, follow the dotted line over to the next step that will state “Go to #”.
Go to that number and again decide between the two options.
Eventually you will wind up at a two name scientific name.
Once you have identified organism i, record your finding in Table 3.
Repeat Steps 1 – 6 for all of the organisms in the dichotomous key (Figure 3).
Table 3: Dichotomous Key Results

Organism

Binomial Name

i

ii

iii

iv

v

vi

vii

viii

ix

x

xi

xii

xiii

Post-Lab Questions

1. What do you notice about the options of each step as they go from number one up?

2. How does your answer from Question 1 relate to the Linnaean classification system?

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Figure 2:Organisms to be identified

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Figure 3:Dichotomous key

Exercise 2: Classification of Organisms

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Materials

Use Table 4 below as well as the “tree” (Figure 4; located at the end of this procedure)

Procedure

Select the first organism from Table 4 (E. coli).
Using the “tree” (Figure 4; located at the end of this procedure) start at the top, and answer each question until the organism reaches the end of a “branch”. Write the organism’s name in the red box.
Repeat this for the remaining organisms.
After classification, fill in Table 4 with the correct domain and kingdom (when applicable) for each organism.
Table 4: Key Characteristics of Some Organisms

Organism

Kingdom

Defined Nucleus

Motile

Cell Wall

Photosynthesis

Unicellular

E. Coli

n/a

Yes

Yes

Protozoa

Yes

Yes

No

Yes

Mushroom

Yes

Yes

Sunflower

Yes

No

Yes

Yes

Bear

Yes

Yes

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Figure 4:Exercise 2 – Classification of Organisms Flow Chart

Post-Lab Questions

1. Did this series of questions correctly organize each organism? Why or why not?

2. What additional questions would you ask to further categorize the items within the domains and kingdoms (Hint: think about other organisms in the kingdom and what makes them different than the examples used here)?

3. What questions would you have asked instead of the ones that you answered about when classifying the organisms

Pre-Lab QuestionsUse the following classifications to determine which organism is least related out of the three. Explain your rationale.

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Classification Level

American Green Tree Frog

European Fire- Bellied Toad

Eastern Newt

Domain

Eukarya

Eukarya

Eukarya

Kingdom

Animalia

Animalia

Animalia

Phylum

Chordata

Chordata

Chordata

Class

Amphibia

Amphibia

Amphibia

Order

Anura

Anura

Caudata

Family

Hylidae

Bombinatoridae

Salamandridae

Genus

Tursipops

Bombina

Notophthalmus

Species

cinerea

bombina

viridescens

How has DNA sequencing affected the science of classifying organisms?
You are on vacation and see an organism that you do not recognize. Discuss what possible steps you can take to classify it.

Exercise 1: Dichotomous Key Practice

A dichotomous key is an identification tool that starts with broad defining characteristics and splits into two options until an organism can be identified. In this exercise, you will identify organisms by their binomial nomenclature using a dichotomous key.

Materials

Dichotomous Key

Images of Organisms

Procedure

1. Start by observing organism i (Figure 2). Once you have taken notice of its physical characteristics, use the dichotomous key (Figure 3) to identify the organism.

2. Start at number 1 on the key and decide if the organism has feature “1a” or feature “1b”.

3. Which ever option you choose, follow the dotted line over to the next step that will state “Go to #”.

4. Go to that number and again decide between the two options.

5. Eventually you will wind up at a two name scientific name.

6. Once you have identified organism i, record your finding in Table 3.

7. Repeat Steps 1 – 6 for all of the organisms in the dichotomous key (Figure 3).

Table 3: Dichotomous Key Results

Organism

Binomial Name

i

ii

iii

iv

v

vi

vii

viii

ix

x

xi

xii

xiii

.jpg” alt=”Figure 2: organisms to be identified”>

Figure 2: Organisms to be identified

.jpg” alt=”Figure 3: dichotomous key”>

Figure 3: Dichotomous key

Exercise 2: Classification of Organisms

Ma terials

Use Table 4 below as well as the “tree” (Figure 4; located at the end of this procedure)

Procedure

1. Select the first organism from Table 4 (E. coli).

2. Using the “tree” (Figure 4; located at the end of this procedure) start at the top, and answer each question until the organism reaches the end of a “branch”. Write the organism’s name in the red box.

3. Repeat this for the remaining organisms.

4. After classification, fill in Table 4 with the correct domain and kingdom for each organism (if applicable).

Table 4: Key Characteristics of Some Organisms

Organism

.jpg” alt=”Figure 4: exercise 2 – classification of organisms flow chart”>

Figure 4: Exercise 2 – Classification of Organisms Flow Chart