Dominant and Recessive Traits (Part 3)

What You'll Learn

Dominant alleles are expressed when present, while recessive alleles are only expressed when two copies are present. A person with one dominant and one recessive allele shows the dominant trait.

Key Words

recessive
life cycle
adaptation

Materials Needed

index cards
markers
ruler

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

Look at the vocabulary words and write a definition for each in your own words.

Step 2 — Do

Compare and contrast prokaryotic and eukaryotic cells. Create a Venn diagram showing their similarities and differences.

Step 3 — Observe

Note any unexpected results and think about why they happened.

Step 4 — Record

Share your findings with the class or a partner and discuss what you learned.

Check Your Understanding

Question 1

1 of 3

What is a dominant trait?