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Lesson 30 of 84 · Heredity
ExperimentDarwin and the Galapagos (Part 2)
What You'll Learn
Charles Darwin observed that finches on different Galapagos Islands had different beak shapes suited to their food sources. This helped him develop the theory of natural selection.
Key Words
- dominant
- recessive
Materials Needed
- onion skin
- iodine stain
- paper
- colored pencils
- coins (for Punnett squares)
- tape
Safety First
- Tie back long hair before starting the experiment.
- Protect your work surface with newspaper or plastic.
- Adult supervision recommended.
Steps
Step 1 — Read
Read about Heredity and write down three key facts.
Step 2 — Do
Model mitosis using pipe cleaners as chromosomes. Show each phase: prophase, metaphase, anaphase, and telophase.
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 3Who is known for the theory of natural selection?