Lesson #2:
Microscopic
Natural Selection
Embedded Files
Learning Target🎯
Learning Target🎯
I can analyze how natural selection causes certain bacteria to become resistant to antibiotics, and explain how human actions can increase this resistance over time.
Success Criteria ✅
Success Criteria ✅
Success Criteria:
I am successful when I can...
🌟 Engage: 🧫 Observe and describe how antibiotics affect bacterial growth by examining visual models or simulations of bacterial colonies.
🔍 Explore: 🔍 Analyze data showing bacterial survival rates after antibiotic exposure to identify patterns of resistance.
💡 Explain: 🧬 Describe how mutations and natural selection lead to antibiotic-resistant bacteria, using terms like selecting agent, trait, and population.
🚀 Elaborate: 🧠 Predict how continued overuse of antibiotics could impact bacterial evolution and explain the long-term consequences for human health.
🎯 Evaluate: 📝 Use evidence from scientific articles or case studies to support a claim about how human actions influence the evolution of antibiotic resistance through natural selection.
Standards:
Standards:
🎯 HS-LS4-4 (Biological Evolution: Unity and Diversity)
Construct an explanation based on evidence for how natural selection leads to adaptation of populations.
Reminders:
Reminders:
EOU Evolution Exam on Thursday, May 1st
Part #1
Warm-Up
Part 2:
Slow Reveal
Antibiotic Resistant
Bacteria
Part 4
2 Box Induction
Why are antibiotic resistant bacteria increasing?
Red Circle = Normal Bacteria
Blue Circle = Antibiotic Resistant Bacteria
Application:
The Varroa mite is an invasive parasite of western honeybees. A mite infestation can cause a honeybee population to collapse. The mite feeds on both adult bees and larvae and can kill the larvae before they hatch. Adult bees try to protect their colony by cleaning out mites and removing infected bees. Beekeepers treat heavily infested hives with oxalic acid, which kills Varroa mites. The data below show information about the number of mites in bee colonies before and after treatment with oxalic acid.
1) Use the information provided to complete the diagram below by circling the arrow in each box that describes the population trend that best supports the explanation that populations of bees are affected by mites and oxalic acid treatment. [1]
2) Based on the data provided, which explanation best describes the effectiveness of using oxalic acid treatments every 18 days to reduce the number of invasive Varroa mites over time?
(1) This treatment would be effective because the number of living mites continues to decrease for several weeks after oxalic acid exposure.
(2) This treatment would not be effective because an individual Varroa mite would become resistant to oxalic acid if they are treated frequently.
(3) This treatment would not be effective because Varroa mites that have a natural resistance to oxalic acid would survive and reproduce.
(4) This treatment would be effective because it gives the Varroa mites enough time to learn to avoid hives that contain oxalic acid.
Part 3
Mid-Point Check
To and Through
Turn and Talk:
Discuss the two questions below in your group.
To
To
What are we learning about?
Through
Through
What story are we learning it through?
Part 4
Echo-Echo
Choral-Choral
Vocabulary
Directions:
Compare and Contrast the two boxes.
How are they related?
How are they different?
Variation: Differences in traits or characteristics between individuals in the same species. These differences can affect how well an organism survives in its environment.
Variation caused by:
1) Mutations - random errors in DNA
2) Sexual Reproduction - During Meiosis and Fertilization, genes come together in new combinations causing variation.
Part 5
S.I.T Protocol
Directions:
1) Read the article
2)
S - Write down one surprising fact
I - Write down one interesting fact
T - Write down one troubling fact
Take-Away
Key Concept:
1) An organism DOES NOT get a trait because it needs it or it is good. Traits only pass on if coded in genes (body builders won't have unnaturally strong children unless in genes).
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