22
Lesson 22 of 84 · Evolution
ExperimentDNA: The Code of Life (Part 2)
What You'll Learn
Genes are segments of DNA that code for specific traits like eye color, hair texture, and blood type. Humans have approximately 20,000 genes spread across 23 pairs of chromosomes.
Key Words
- nucleus
- DNA
Materials Needed
- index cards
- markers
- ruler
- scissors
- microscope (or magnifying glass)
Safety First
- Do not mix unknown chemicals together.
- Tie back long hair before starting the experiment.
- Protect your work surface with newspaper or plastic.
Steps
Step 1 — Read
Read and learn: Genes are segments of DNA that code for specific traits like eye color, hair texture, and blood type. Humans have approximately 20,000 genes spread across 23 pairs of chromosomes.
Step 2 — Do
Build your model using the materials provided.
Step 3 — Observe
Use your senses (except taste) to describe what you notice.
Step 4 — Record
Write a summary of your findings in 3-5 sentences.
Check Your Understanding
Question 1
1 of 3What is a gene?