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Lesson 37 of 84 · Heredity
SimulationMass Extinctions Through History (Part 2)
What You'll Learn
Extinction occurs when the last member of a species dies. Mass extinctions have occurred several times in Earth's history, the most famous killing the dinosaurs 66 million years ago.
Key Words
- species
- heredity
- cell
Steps
Step 1 — Read
Read the introduction and identify the main idea of this lesson.
Step 2 — Do
Extract DNA from a strawberry using dish soap, salt, water, and rubbing alcohol. Observe the stringy white substance—that's DNA!
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 an allele?