Mississippi Science GEN.2B.3
The Standard
- GEN.2B
- Students will determine the causes and effects of mutations in DNA.
Describe cellular mechanisms that can help to minimize mutations (e.g., cell cycle checkpoints, DNA polymerase proofreading, and DNA repair enzymes).
2026 Mississippi College- and Career-Readiness Standards for Science · Transcription, Translation, and Mutations
Teacher's field guide
What This Standard Means
What Students Need to Do
- Students explain how DNA polymerase checks new DNA as it is copied and how repair enzymes fix errors or damage. They explain how checkpoints pause the cell cycle when a problem is detected.
What Mastery Looks Like
- Given a copying mistake, a student identifies proofreading as the first chance to correct it. They explain that repair enzymes can fix remaining errors and that a checkpoint can pause division while the cell responds. They know these steps do not catch every error.
Common Misconceptions
- Students may think checkpoints fix DNA, rather than pause the cell cycle. They may confuse proofreading with repair enzymes or assume every copying error is caught.
How to Assess It
- Exit ticket: An incorrect base is added while DNA is copied. What checks it right away, what can a checkpoint do before division, and what could happen if the error remains?
Lesson moves
Ways to Teach It
Give pairs a printed DNA template and a copy with one wrong base; have them circle and correct the mismatch as DNA polymerase would.
Ask students to write: 'Why might a cell pause before dividing if its DNA is damaged?' Require them to name repair enzymes.
Deal cards showing a copying mismatch, UV-damaged DNA, and a cell about to divide with damaged DNA; students choose the next response.
Show a skin cell diagram with UV-linked thymine bases; students mark the damage and explain why the cell might pause division.
Keep exploring
Related Standards
- GEN.2B.1
Identify factors that cause mutations (e.g., environmental, errors in replication, and viral infections).
- GEN.2B.4
Investigate the role of mutations and the loss of cell cycle regulation in the development of cancers.
- GEN.1B.3
Microscopically observe and analyze the stages of the cell cycle (G1-S-G2-M) to describe the phenomenon and identify methods at different cell cycle checkpoints...
- FB.4.4
Obtain and communicate information to describe how mutations may affect genetic expression and provide examples.
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