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
species

Steps

Step 1 — Read

Read and 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.

Step 2 — Do

Repeat the experiment two more times for accuracy.

Step 3 — Observe

Observe what happens and describe it in detail.

Step 4 — Record

Record your observations in your science journal.

Check Your Understanding

Question 1

1 of 3

What is the shape of DNA?