Plants with beneficial traits have been developed.In all of the following GM crops, a gene of interest has been inserted,except:

Options

A. transgenic canola for herbicide (glyphosate) armigera)
B. Bt cotton resistant to bollworm (Helicoverpa) armigera)
C. Flavr savr tomato with delayed ripening
D. Herbiide resistant tobacco.

Answer

To solve the question about genetically modified (GM) crops and identify which one does not have a gene of interest inserted, we can follow these steps:

### Step 1: Understand the Question
The question asks us to identify which of the listed GM crops does not have a gene of interest inserted. This implies that we need to analyze each option to see if a gene has been inserted or modified.

### Step 2: Analyze Each Option
1. **Transgenic Colona for Herbicides**:
- In this crop, a gene has been inserted to make the plant resistant to herbicides. Therefore, a gene of interest has been inserted here.

2. **Bt Cotton Resistant to Bull Worm**:
- Bt cotton has been genetically modified to include the cry gene from *Bacillus thuringiensis*, which provides resistance to pests like bull worms. Thus, a gene of interest has also been inserted here.

3. **Flavor Saver Tomato with Delayed Ripening**:
- This tomato has been modified to silence the Ptom6 gene, which is responsible for the softening of tomatoes. In this case, no new gene has been inserted; instead, an existing gene's activity has been suppressed. This indicates that this option does not involve the insertion of a new gene of interest.

4. **Herbicide Resistant Tobacco**:
- Similar to the first option, this tobacco plant has been genetically modified to include a gene that confers herbicide resistance. Therefore, a gene of interest has been inserted here as well.

### Step 3: Identify the Correct Answer
From the analysis:
- Options 1, 2, and 4 all involve the insertion of genes of interest.
- Option 3 (Flavor Saver Tomato) does not involve the insertion of a new gene but rather the silencing of an existing gene.

Thus, the correct answer is **Flavor Saver Tomato with delayed ripening**.

### Final Answer
The GM crop in which a gene of interest has not been inserted is **Flavor Saver Tomato with delayed ripening**.

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