Glofish are zebrafish that contain a gene from either a coral or jellyfish. This is an example of

Question

BlackTom AI · Accepted Answer

Gene addition refers to introducing a novel gene from one organism into another so the recipient gains a new trait not previously encoded in its genome.

1. Relevant knowledge points and concepts
- Transgenic organism: an organism that carries genes from another species introduced by genetic engineering.
- Gene addition (transgene insertion): adding a foreign gene into the host genome so it is expressed alongside the host’s existing genes.
- Gene replacement: swapping or replacing an endogenous gene with another sequence, so the original gene is removed or altered.
- Gene editing: targeted modification of existing sequences (e.g., CRISPR) to change, disrupt, or correct genes rather than simply adding a new foreign gene.

2. Step-by-step reasoning
- Glofish are zebrafish that fluoresce because they carry a fluorescent protein gene originally derived from coral or jellyfish.
- The fluorescent gene is introduced into the zebrafish genome and expressed; the zebrafish retains its original genes and gains the new trait.
- This process matches the definition of adding a transgene rather than replacing or editing an existing zebrafish gene.

3. Calculations or intermediate steps
- No numerical calculation is required. The logical intermediate step is recognizing whether the zebrafish gene was replaced or whether a foreign gene was inserted; evidence points to insertion of a new gene.

4. Why the correct answer is correct
- Because the coral/jellyfish fluorescent gene is inserted into zebrafish to create a new phenotype (fluorescence), the procedure is gene addition: introducing and expressing an extra gene.

5. Why the other options are incorrect
- "Gene replacement": incorrect because the native zebrafish genes were not swapped out; they were retained while a foreign gene was added.
- "Gene editing": incorrect because the process did not primarily involve targeted modification of existing zebrafish genes (such as repairing or editing sequences) but rather addition of an external gene.
- "Both a and b": incorrect because the situation does not involve gene replacement, so both cannot apply.

6. Conclusion
The correct choice is gene addition. This matches the provided answer: "gene addition."

Glofish are zebrafish that contain a gene from either a coral or jellyfish. This is an example of单项选择题

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