In a ______You Follow the Steps Based on ______Of an Organism to Classify the Organism

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How do we classify unknown organisms?

Dichotomous Key

In a ______you follow the steps based on ______of an organism to classify the organism by its scientific name (______).

How it works! Based on these observations, a taxonomist chooses ______of the statements in the first pair. Each statement leads either to the ______of an organism or to another ______of statements. By working through an entire set of statements, a taxonomist can ______an organism.

Let’s Practice!You are a scientist working in the field and you discover the organism above and need to classify it. Use the key below to discover what type of organism you have discovered.

Your Turn!

Classify the following organisms:

Reading a Phylogenic Tree

Reading Cladograms

Classification Homework

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1. Which of the following sequences represents the classification of an organism from most general to most specific?

1. Phylum, Kingdom, Class, Order, Family, Genus, Species
2. Genus, Species, Order, Family, Class, Phylum, Species
3. Kingdom, Phylum, Class, Order, Family, Genus, Species
4. Kingdom, Phylum, Class, Family, Order, Genus, Species

2. An organism is eukaryotic, multicellular, autotrophic, and has a cell wall. To which kingdom does it belong?

1. AnimaliaC. Fungi
2. PlantaeD. Protista

3. For the organism Ursus maritimus, the name “maritimus” refers to which of the following?

1. GenusC. Order
2. SpeciesD. Kingdom

4. The diagram below shows the evolutionary relationships between several groups of organisms.

Organisms with the least biochemical similarities would most likely be found in which pair of genera?

1. 1 and 2C. 1 and 4
2. 3 and 4D. All are equal

5. According to the dichotomous key below, Bird A is correctly identified as

1. Commorant
2. Eagle
3. Jacana
4. Kingfisher

6. In the cladogram below, which organisms have amniotic eggs and hair?

1. Crocodiles and birds
2. Rabbits and primates
3. Amphibians and birds
4. Amphibians and primates

1. Classification schemes may change due to which of the following reasons?

1. The DNA is sequenced for two organisms, discovering many similarities
2. Looking at the embryos, scientists see developmental similarities between the organisms
3. Dissections show that there are similar bones that perform different functions in two organisms
4. All of the above

1. An organism is eukaryotic, multicellular, heterotrophic, and has a cell wall. To which kingdom does it belong?

1. AnimaliaC. Fungi
2. PlantaeD. Protista

1. An organism is eukaryotic, multicellular, heterotrophic, and has a cell wall. To which kingdom does it belong?

1. AnimaliaC. Fungi
2. PlantaeD. Protista

1. Which two organisms in the chart below have chromosomes that are most similar in genetic composition?

1. A and B
2. B and C
3. C and D
4. A and D

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