Mutations and Variation

What You'll Learn

Genetic variation within a population is essential for evolution. Variation comes from mutations, sexual reproduction, and gene flow between populations.

Key Words

trait
dominant

Materials Needed

index cards
markers
ruler
scissors
microscope (or magnifying glass)
slides

Safety First

Protect your work surface with newspaper or plastic.

Steps

Step 1 — Read

Review the background information on Heredity before starting.

Step 2 — Do

Prepare a wet-mount slide of an onion skin and observe it under a microscope (or magnifying glass). Draw and label the cell wall, cell membrane, and nucleus.

Step 3 — Observe

Watch carefully for any changes and note the time.

Step 4 — Record

Create a data table to organize your measurements.

Check Your Understanding

Question 1

1 of 3

What does DNA stand for?