Genes and Traits (Part 5)

What You'll Learn

Natural selection is the process where organisms with traits better suited to their environment survive and reproduce more successfully. Over time, this drives evolution.

Key Words

DNA
gene

Materials Needed

onion skin
iodine stain
paper
colored pencils

Safety First

Use materials only as directed in the experiment.
Keep small objects away from young children.
Work in a well-ventilated area when using vinegar or other strong-smelling substances.

Steps

Step 1 — Read

Review the background information on Genetics before starting.

Step 2 — Do

Survey your class for a genetic trait (attached vs. free earlobes, tongue rolling, hitchhiker's thumb). Create a bar graph of the results.

Step 3 — Observe

Look for patterns in your observations.

Step 4 — Record

Make a graph or chart showing your results.

Check Your Understanding

Question 1

1 of 3

What is natural selection?