Distinguish sequence changes

Supplied materials

• All measurements and observations below are supplied classroom examples. They are not data from actual learners or a claim about a particular real site.
• Paper or a browser document for a labeled drawing, table or explanation.
• Worked problem inputs: An original RNA coding representation is AUGGCUAAG. Inserting A after the first base gives AAUGGCUAAG. Regroup the bases into complete triplets from the same starting position.
• Assessment case 1: The supplied sequence ACGT becomes AGGT with the same length. What direct change occurred? Which inference or prediction is best supported?
• Assessment case 2: Which scientific label fits the specifically described step or feature? Supplied case: ACGT becomes ACGGT.
• Assessment case 3: Which scientific label fits the specifically described step or feature? Supplied case: ACGT becomes AGT.
• Assessment case 4: Which scientific label fits the specifically described step or feature? Supplied case: ACGT remains ACGT.
• Assessment case 5: Which scientific label fits the specifically described step or feature? Supplied case: TTAC becomes TGAC.
• Assessment case 6: The supplied sequence GTACT becomes GACT. Which immediate effect is established? Which inference or prediction is best supported?

Learn the idea

A substitution replaces a base; insertion adds bases and deletion removes them. A change may have different effects depending on sequence context and whether a coding reading frame is altered.

Substitution means one base replaced by another. Insertion means one or more bases added. Deletion means one or more bases removed. Unchanged means compared sequences are identical.

For the supplied mechanism problem, An original RNA coding representation is AUGGCUAAG. Inserting A after the first base gives AAUGGCUAAG. Regroup the bases into complete triplets from the same starting position. The original groups are AUG GCU AAG; the changed groups are AAU GGC UAA with G left incomplete. A one-base insertion shifts downstream reading groups. This representation demonstrates the frame effect, not a diagnosis or real organism outcome.

1. Read the supplied problem and mark the structures, processes or quantities named: An original RNA coding representation is AUGGCUAAG. Inserting A after the first base gives AAUGGCUAAG. Regroup the bases into complete triplets from the same starting position.
2. Draw the relevant boundary, pathway or comparison and label it using the scientific ideas above.
3. Write a causal explanation or calculation, showing how each observation supports the result.
4. Compare your reasoning with the worked solution; name a condition that would change or limit the inference.

Check your reasoning

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Take it further

New grouping task: sequence AUGCCUAAA becomes AUGCCCUAAA after one inserted C. Expected: original AUG CCU AAA, changed AUG CCC UAA with A incomplete; downstream triplets shift after insertion.

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