Description

This dihybrid cross worksheet and lesson takes the stress out of teaching two-trait crosses. A step-by-step PowerPoint shows students how to FOIL the parents’ genotypes to find every possible gamete combination. Then it walks them through setting up a 16-box dihybrid Punnett square, completing the cross, and finding the possible offspring. Afterward, students practice on the 4-problem dihybrid cross worksheet, and you check it with the answer key.

What’s Included

• Step-by-step PowerPoint
• Student notes outline
• Dihybrid cross practice worksheet (4 problems)
• Answer keys for the notes outline and practice worksheet

Good to Know

• Grades: high school biology
• Method: FOIL to find gametes, then a 16-box Punnett square

See it in action:

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Related Resources

• Punnett Square Game
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FAQ

How do students find the gametes?
They use the FOIL method on the parents’ genotypes.

How many practice problems are there?
4 dihybrid cross problems.

Are answer keys included?
Yes, for both the notes outline and the practice worksheet.