15
Lesson 15 of 84 · Evolution
ExperimentGenetic Variation in Populations
What You'll Learn
DNA (deoxyribonucleic acid) carries the genetic instructions for building and maintaining an organism. It is shaped like a twisted ladder called a double helix.
Key Words
- adaptation
- fossil record
- species
Materials Needed
- onion skin
- iodine stain
- paper
- colored pencils
- coins (for Punnett squares)
- tape
Safety First
- Dispose of materials properly after the experiment.
Steps
Step 1 — Read
Read and learn: DNA (deoxyribonucleic acid) carries the genetic instructions for building and maintaining an organism. It is shaped like a twisted ladder called a double helix.
Step 2 — Do
Repeat the experiment two more times for accuracy.
Step 3 — Observe
Observe what happens and describe it in detail.
Step 4 — Record
Record your observations in your science journal.
Check Your Understanding
Question 1
1 of 3What is the shape of DNA?