Natural Selection and Population Change
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Objective
I can explain how natural selection leads to changes in populations over time.
Part 1 of 4
Warm-up video
Amoeba Sisters · 7:23Vetted channel
We don't generate video — this one is by Amoeba Sisters on YouTube. The practice questions and exit ticket below were drafted by AI for this objective, and every question is editable in the teacher guide.
Part 2 of 4
Key concepts
3 concepts
- 1
Natural selection is a mechanism of evolution, which is change in a population over time.
- 2
In a particular environment, organisms with traits that allow them to survive and reproduce have higher fitness, and those traits become more frequent in the population.
- 3
Mutations and variations are random, but if they have a positive effect on an organism’s fitness, then that trait will be more frequent in the population over time.
Part 3 of 4
Practice
12 questions
Define natural selection in your own words, based on the video.
Explain how the concept of 'fitness' is defined in biology, as described in the video.
Part 4 of 4
Exit ticket
Quick comprehension check
“Explain how the overuse of antibiotics can lead to antibiotic resistance in bacteria populations through natural selection.”
Sample answer included in the free materials
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Teacher guide, student handout, and slides — free, in Google Docs format
Teacher Guide
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Student Handout
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