Dichotomous Keys: TEKS 7.11A HAPPY MONDAY

Bellwork: Complete and write out the steps for organism “B” – The snail.

“Walking Review”Page 53 of your

I.A.N.

Organism

Cat Wolf Fly

Kingdom

Animalia Animalia Animalia

Phylum

Chordata Chordata Arthropoda

Class Mammalia Mammalia Insecta

Order Carnivora Carnivora Diptera

Family Felidae Canidae Muscidae

Genus Felis Canis Musca

Species

F. domesticus

C. lupus M. domestica

1. What type of animal is Musca domestica?

2. From the table, which 2 animals are most closely related?

3. At what classification level does the evolutionary relationship between cats and wolves diverge (become different)?

4. What is the scientific name for the Canada goose?

5. Explain which two organisms are the most closely related.

6. Which taxons do the human and goose have in common?

7. At which taxon do the lion and bobcat diverge?

8. Which kingdom does C. comatus belong to?

9. Which taxons do the lion and bobcat have in common?

10. What is the scientific name for the lion?

African Buffalo Burchell’s Zebra Grant’s Gazelle

AnimaliaChordataMammalia

ArtiodactylaBovidae

Synceruscaffer

AnimaliaChordataMammalia

PerissodactylaEquidae

Equusburchellii

AnimaliaChordataMammalia

ArtiodactylaBovidae

Nangergranti

11. Describe 2 conclusions that can be made from this information.

• The mushroom sea squirt is in the same class as the common sea grape.• The mushroom sea squirt is in the same family as the blue spot ascidian.• The mushroom sea squirt is in the

same order as the white speck tunicate.• The mushroom sea squirt is in the

same phylum as the starry skate.

The information below describes the most specific levels of classification that the mushroom sea squirt, Sycozoa gaimardi,

shares with four other organisms.

12. To which of the four organisms is the mushroom sea squirt most closely related?

13. Which of the beetles above must belong to the same family?

14. Four students researched the

classifications of the following eight

whales:

killer whale, Orcinus orca

gray whale, Eschrichtius robustus

humpback whale, Megaptera

novaeangliae

pygmy right whale, Caperea marginata

fin whale, Balaenoptera physalus

minke whale, Balaenoptera acutorostrata

North Atlantic right whale, Eubalaena

glacialis

bowhead whale, Balaena mysticetus

The students were asked which two

whales are most closely related and why.

The table below summarizes the

students’ answers.

Based on the classifications, which

student gave the correct answer to the

question?

Student Whales Most

Closely Related

Reason

1 killer whale and gray whale

They are both

mammals.

2 humpback whale and

pygmy right whale

They are both

whales.

3 fin whale and minke

whale

They are both in

the same genus.

4 North Atlantic

right whale and bowhead

whale

They are both in

the same family.

CaliforniaSea Lion

GalápagosSea Lion

New ZealandSea Lion

Kingdom Animalia Animalia  Animalia

Phylum Chordata Chordata  Chordata

Class Mammalia Mammalia  Mammalia

Order Carnivora Carnivora  Carnivora

Family Otariidae Otariidae  Otariidae

Genus Zalophus Zalophus Phocarctos

Species californianus wollebaeki  hookeri

15. Which two organisms are most closely related?

16. Which taxa do all three organisms share?

17.The Ursidae family of animals includes the giant panda, the brown bear, the polar bear, and the spectacled bear. Which of the following characteristics best helps classify these bears into genus and species levels?

A.eating habits B.gene sequences C.method of reproduction D.location of natural habitat

Mammal DNA Sequence

1 TCTCAACTACAA

2 TCTCAGCTGCAA

3 ACTCAGCTACAA

4 TCTCAGCTGCAG

Scientists compared the DNA sequence of a gene in four mammals. A portion of the gene’s DNA sequence in each mammal is shown below.

18. Based on the sequence data, which of the mammals are most closely related to each other?

19. Identify the organism pictured below

20. Identify the organism pictured below

21. Identify the organism pictured below

Answer Key

Organism

Cat Wolf Fly

Kingdom

Animalia Animalia Animalia

Phylum

Chordata Chordata Arthropoda

Class Mammalia Mammalia Insecta

Order Carnivora Carnivora Diptera

Family Felidae Canidae Muscidae

Genus Felis Canis Musca

Species

F. domesticus

C. lupus M. domestica

1. What type of animal is Musca domestica?Fly

2. From the table, which 2 animals are most closely related?

Cat and Wolf3. At what classification level does the

evolutionary relationship between cats and wolves diverge (become different)?

Family

4. What is the scientific name for the Canada goose?

Branta canadensis5. Explain which two organisms are the most closely related.

Lake Darner and Mosquito6. Which taxons do the human and goose have

in common?Kingdom and Phylum

7. At which taxon do the lion and bobcat diverge?

Genus8. Which kingdom does C. comatus belong to?

Fungi9. Which taxons do the lion and bobcat have in common?

Domain, Kingdom, Phylum, Class, Order, and Family

10. What is the scientific name for the lion?Panthera leo

African Buffalo Burchell’s Zebra Grant’s Gazelle

AnimaliaChordataMammalia

ArtiodactylaBovidae

Synceruscaffer

AnimaliaChordataMammalia

PerissodactylaEquidae

Equusburchellii

AnimaliaChordataMammalia

ArtiodactylaBovidae

Nangergranti

11. Describe 2 conclusions that can be made from this information.

Refer to chart

• The mushroom sea squirt is in the same class as the common sea grape.• The mushroom sea squirt is in the same family as the blue spot ascidian.• The mushroom sea squirt is in the

same order as the white speck tunicate.• The mushroom sea squirt is in the

same phylum as the starry skate.

The information below describes the most specific levels of classification that the mushroom sea squirt, Sycozoa gaimardi,

shares with four other organisms.

12. To which of the four organisms is the mushroom sea squirt most closely related?

The Blue-Spot Ascidian

13. Which of the beetles above must belong to the same family?

14. Four students researched the

classifications of the following eight

whales:

killer whale, Orcinus orca

gray whale, Eschrichtius robustus

humpback whale, Megaptera

novaeangliae

pygmy right whale, Caperea marginata

fin whale, Balaenoptera physalus

minke whale, Balaenoptera acutorostrata

North Atlantic right whale, Eubalaena

glacialis

bowhead whale, Balaena mysticetus

The students were asked which two

whales are most closely related and why.

The table below summarizes the

students’ answers.

Based on the classifications, which

student gave the correct answer to the

question?

Student Whales Most

Closely Related

Reason

1 killer whale and gray whale

They are both

mammals.

2 humpback whale and

pygmy right whale

They are both

whales.

3 fin whale and minke

whale

They are both in

the same genus.

4 North Atlantic

right whale and bowhead

whale

They are both in

the same family.

CaliforniaSea Lion

GalápagosSea Lion

New ZealandSea Lion

Kingdom Animalia Animalia  Animalia

Phylum Chordata Chordata  Chordata

Class Mammalia Mammalia  Mammalia

Order Carnivora Carnivora  Carnivora

Family Otariidae Otariidae  Otariidae

Genus Zalophus Zalophus Phocarctos

Species californianus wollebaeki  hookeri

15. Which two organisms are most closely related?California Sea Lion and Galapagos Sea Lion

16. Which taxa do all three organisms share? Kingdom, Phylum, Class, Order, Family

17.The Ursidae family of animals includes the giant panda, the brown bear, the polar bear, and the spectacled bear. Which of the following characteristics best helps classify these bears into genus and species levels?

A.eating habits B.gene sequences C.method of reproduction D.location of natural habitat

Mammal DNA Sequence

1 TCTCAACTACAA

2 TCTCAGCTGCAA

3 ACTCAGCTACAA

4 TCTCAGCTGCAG

Scientists compared the DNA sequence of a gene in four mammals. A portion of the gene’s DNA sequence in each mammal is shown below.

18. Based on the sequence data, which of the mammals are most closely related to each other?

Mammals 2 and 4

19. Identify the organism pictured belowAlbizia julibrissin

20. Identify the organism pictured belowPusa hispida

21. Identify the organism pictured belowPhylum Platyhelminthes