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Lesson 80 of 84 · Inheritance and Traits
ExperimentGenes and Traits (Part 5)
What You'll Learn
Natural selection is the process where organisms with traits better suited to their environment survive and reproduce more successfully. Over time, this drives evolution.
Key Words
- gene
- dominant
Materials Needed
- slides
- onion skin
- iodine stain
- paper
Safety First
- Dispose of materials properly after the experiment.
Steps
Step 1 — Read
Review the background information on Inheritance and Traits before starting.
Step 2 — Do
Survey your class for a genetic trait (attached vs. free earlobes, tongue rolling, hitchhiker's thumb). Create a bar graph of the results.
Step 3 — Observe
Look for patterns in your observations.
Step 4 — Record
Make a graph or chart showing your results.
Check Your Understanding
Question 1
1 of 3What is natural selection?