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

parent
characteristic

Materials Needed

scissors
microscope (or magnifying glass)
slides

Safety First

Wash hands after handling materials.
Be careful with scissors — ask an adult for help if needed.
Do not look directly at the sun or bright lights.

Steps

Step 1 — Read

Read about Inheritance and Traits 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?