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Lesson 45 of 84 · Genetics
ExperimentDominant 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
- mitosis
- meiosis
Materials Needed
- slides
- onion skin
- iodine stain
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
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 3What is a dominant trait?