Mutations and Variation (Part 2)

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

adaptation
fossil

Materials Needed

iodine stain
paper
colored pencils
coins (for Punnett squares)
tape
index cards

Safety First

Handle glass items carefully to avoid breakage.

Steps

Step 1 — Read

Review the background information on Inheritance and Traits 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?