Objective: SWBAT investigate body structure differences by analyzing population changes over many generations
Do Now:
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Question 1
1.
Imagine a population of frogs that live in the forest. The frogs have a green coloring on top that helps them blend into the forest so they are not noticed by predators. Imagine that half of this population stayed in the forest and the other half of the population moved to the hills above the forest, which are drier, with some brown grass and brown soil.
Which population of frogs is likely to have more changes after many generations? Explain.
(HINT: look at the environments for each descendant)
Exit Ticket Review:
Exemplar Reponse:
"The Galapagos Tortoise had separated due to the change in environments from the mainland tortoises.
They adapted to the new environment because they mutate, those mutations can be adaptive or non adaptive and in this case they were adaptive.
Since they were adaptive tortoises with those mutations lived longer and were able to pass those mutations to the next generation and when a whole lot of these mutations are introduced they are able to adapt to that new environment."
Approaching Response:
"One of the changes was a upward curved shell for the Galapagos tortoise, and it happened because of an mutation that later became an adaptive trait as the adaptive trait allowed the Galapagos tortoise to live long enough to reproduce and pass their traits to the next generation."
Guided Notes:
Vocabulary:
Body structure: a part of an organism (for example, one or more bones)
Common ancestor population: an older population from which two or more newer species descended
Descendant species: a more recent species that evolved from an ancestor population
Evolution: the process by which species adapt to environmental changes over a very long time
Shared structure: a body structure in two or more species that features the same parts (for example, the same bones)
Speciation: the process by which one population evolves into two or more different species
Species: a group of organisms of the same kind (in one or more populations) that do not reproduce with organisms from any other group
Stability: when something stays mostly the same over time
A common ancestor population of ostrilopes was split into two different environments:
Environment A
Environment B.
Model one of these environments in the Natural Selection Simulation, and you will both compare the descendant species that come from these two populations. First, predict whether each ostrilope population will change, and if so, how it will change.
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Question 2
2.
Predict the population in Environment A, which changed to have some tall Thornpalms (trees).
Do you think the population in Environment A will remain stable or change over time if thornpalms are taller?
(HINT: the environments are changing)
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Question 3
3.
Predict Environment B, which changed to have some Thornpalms with large thorns.
Do you think the population in Environment B will remain stable or change over time if thornpalms are have larger thorns?
Practice:
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Question 4
4.
-DATA ANALYSIS- 1
Analyze the following data tables on Ostrilope neck length and jaw strength and answer the discussion questions below.
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Question 5
5.
-DATA ANALYSIS- 2
Analyze the following data tables on Ostrilope neck length and jaw strength and answer the discussion questions below.
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Question 6
6.
Compare the two environments where the ostrilope population was split. What were the two different environmental differences after the split?
(HINT: What happened in environment A, environment B?)
Exit Ticket:
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Question 7
7.
Compare the shared structures of the two ostrilope populations from the two environments. What were the structural differences in the ostrilope population?
"In environment A the ostrilopse became ....
In environment B the ostrilopse became ... "
(THINK: what traits became most common in generation 50 from the tables above)
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Question 8
8.
How does an ancestor population evolve into descendant species with differences in their shared structures? Use evidence from the Simulation pictures to support your answer.
CFS:
student describes the relationship between anatomical similarities and differences in animal species
student describes the environmental changes that cause traits to become adaptive over time