STICKLEBACK LAB – DAY 1
Introduction to Stickleback Evolution
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Prepare for your exams
Study with the several resources on Docsity
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Earn points by helping other students or get them with a premium plan
Stickleback Lab: Analyzing Fish Phenotypes and Adaptations, Exercises of Theory of Evolution
A three-day virtual lab experience focused on the study of stickleback fish, their phenotypes, and adaptations. Students are expected to complete various experiments, answer questions related to the data collected, and engage in activities such as Chi-Square Analysis, sorting fish based on armor plates, and collecting data on gill rakers. The document also includes references to scientific articles.
Typology: Exercises
2021/2022
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STICKLEBACK LAB – DAY 1
Introduction to Stickleback Evolution
STICKLEBACK EVOLUTION VIDEO
CHECK FOR UNDERSTANDING
HHMI STICKLEBACK VIRTUAL LAB
- Complete the Experiment 1
- STOP when you reach Experiment 1 Analysis
- Answer questions 9-23 on your lab sheet
*For the graph (#20), click the very bottom “click here” for the computer generated graph after you have totaled all of your data.
HHMI STICKLEBACK VIRTUAL LAB
- Null Hypothesis
The expected observation in nature.
In a classroom, we expect there to be 50% boys and 50% girls.
The Null Hypothesis would be: There are equal numbers of boys and girls in the classroom.
HHMI STICKLEBACK VIRTUAL LAB
- Null Hypothesis What is the null hypothesis for this lab?
There are an equal number of fish with pelvic spines present and absent in the lake.
What is the data?
Bear Paw Lake Frog Lake Morvoro Lake
Pelvic Spines Present (^) 0 20 8
Pelvic Spines Absent (^) 20 0 12
HHMI STICKLEBACK VIRTUAL LAB
CHI-SQUARE CALCULATIONS
Bear Paw Lake
Phenotype Observed (o) Expected (e) (o-e) (o-e) 2 (o-e) 2 /e
Pelvic Spines
Present
Pelvic Spines Absent
Total = Total = X^2 =
HHMI STICKLEBACK VIRTUAL LAB
CHI-SQUARE CALCULATIONS
Frog Lake
Phenotype Observed (o) Expected (e) (o-e) (o-e) 2 (o-e) 2 /e
Pelvic Spines
Present
Pelvic Spines Absent
Total = Total = X^2 =
HHMI STICKLEBACK VIRTUAL LAB
- Degrees of Freedom – the number of items in a set minus one.
- Set = Phenotype
- Number of items: 2 – Pelvic spines present and Pelvic spines absent - Degrees of Freedom = (when your class reaches the answer, type here)
HHMI STICKLEBACK VIRTUAL LAB
Lake p value Null hypothesis
Bear Paw Lake
Frog Lake
Morvoro Lake
STICKLEBACK PREDATORS
- Answer question 1
DEFENSE LAB
- Look at the Stickleback Fish Image Set
- Sort the fish into two groups based on what you learned from the digital lab
- Answer questions 2 and 3
ARMOR PLATES
- There is consistent data that supports the hypothesis that if a stickleback lives in a marine environment, it will have more armor plates than stickleback in freshwater.
- Why do you think a marine stickleback needs more armor plates?
- Answer questions 5-6 on your lab sheet.
*To calculate average: Add up the number of plates in one category and divide by the number of specimens in that category.