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Lesson 3 of 84 · Cells
ExperimentDNA: The Code of Life
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
- gene
Materials Needed
- index cards
- markers
- ruler
- scissors
- microscope (or magnifying glass)
Safety First
- Wash hands after handling materials.
- Be careful with scissors — ask an adult for help if needed.
- Do not look directly at the sun or bright lights.
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?