Homologous Structures: Evidence for Evolution (Part 2)

What You'll Learn

Homologous structures are similar body parts in different species that suggest a common ancestor. The arm bones of humans, whales, bats, and dogs share the same basic structure.

Key Words

adaptation
fossil record

Materials Needed

colored pencils
coins (for Punnett squares)
tape

Safety First

Tie back long hair before starting the experiment.
Protect your work surface with newspaper or plastic.
Adult supervision recommended.

Steps

Step 1 — Read

Read about Heredity and write down three key facts.

Step 2 — Do

Research one genetic disorder. Create an infographic showing its cause, symptoms, and how it is inherited.

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 are homologous structures?