42
Lesson 42 of 84 · Cells
ExperimentGenes and Traits (Part 3)
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
- DNA
- gene
Materials Needed
- paper
- colored pencils
- coins (for Punnett squares)
- tape
Safety First
- Clean up spills immediately to prevent slipping.
- Use materials only as directed in the experiment.
- Keep small objects away from young children.
Steps
Step 1 — Read
Review the background information on Cells 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?