Genetic 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

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?