Objective: SWBAT use observations of body structures to make inferences about common ancestors.
Do Now:
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Question 1
1.
The discovery that the Mystery Fossil was pregnant tells us that the Mystery Fossil came from a species that gave live birth. What do you know about how whales, wolves, or crocodiles carry their babies?
(THINK: do the animals have live births like humans? OR do they lay eggs that eventually hatch?)
Exit Ticket Review:
Exemplar:
"I think that humans and blue whales are related species. I think this because they share many of the same structures. Similar structures are Backbones, front limbs, lungs, and structures for producing milk. Based on the number of similarities I think that they must share a common ancestor and are related species."
Approaching:
"Humans and blue whales are related species because they have multiple parts of their bodies that are similar and or the same."
Guided Notes:
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Question 2
2.
Paleontologists look for shared body structures in different species. There are many different body structures and some of them can be difficult to find. Which of the body structures in the list can you find in each of the species below?
Cross out the structures that the Mystery Fossil does not have, leaving only the present traits:
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Question 3
3.
Cross out the structures that the Whale does not have, leaving only the present traits:
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Question 4
4.
Cross out the structures that the Wolf does not have, leaving only the present traits:
Practice:
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Question 5
5.
Which bone structures are similar between the Mystery Fossil, whale, and wolf?
CFS:
student describes the relationship between anatomical similarities and differences in animal species
student describes the chronological difference between animal species with a common ancestor based on body structures
"The mystery fossil, whale, and wolf all SHARE .... "
(THINK: list the features they all share)
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Question 6
6.
Based on your answer to Question 5, do you think the whales, wolves, and the Mystery Fossil are related?
CFS:
student describes the relationship between anatomical similarities and differences in animal species
student describes the chronological difference between animal species with a common ancestor based on body structures
"Assuming the three animals are realted based on the information given. A common ancestor of the mystery fossil, whale, and woves will have ... I think this because .... "
(THINK: list the structures that you think a common ancestor has using the list from 2-4)
Exit Ticket:
1 point
1
Question 7
7.
Identify the ‘descendant’s and the ‘common ancestor population’ shown below.
. CFS:
student describes the relationship between anatomical similarities and differences in animal species
student describes the chronological difference between animal species with a common ancestor based on body structures
"I think that the descendants are ... because ...
"I think that the common ancestors are ... because ... "
2 points
2
Question 8
8.
How can you use structural evidence to help support why Species B and Species C are related species?
CFS:
student describes the relationship between anatomical similarities and differences in animal species
student describes the chronological difference between animal species with a common ancestor
"Species B and Species C are realted based on the information given. I think this because .... "
(THINK: list the structures that you see both Species B, C and the descendant all share)