DNA: The Code of Life (Part 4)

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

inherit
gene
dominant

Materials Needed

microscope (or magnifying glass)
slides
onion skin
iodine stain
paper
colored pencils

Safety First

Clean up spills immediately to prevent slipping.
Use materials only as directed in the experiment.
Keep small objects away from young children.

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 3

What is a gene?