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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