Genetic Variation in Populations (Part 4)

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

Materials Needed

ruler
scissors
microscope (or magnifying glass)
slides
onion skin

Safety First

Protect your work surface with newspaper or plastic.
Adult supervision recommended.

Steps

Step 1 — Read

Study the diagram and label the parts you recognize.

Step 2 — Do

Compare and contrast prokaryotic and eukaryotic cells. Create a Venn diagram showing their similarities and differences.

Step 3 — Observe

Observe what happens and describe it in detail.

Step 4 — Record

Record your observations in your science journal with measurements and descriptions.

Check Your Understanding

Question 1

1 of 3

What is the shape of DNA?