Cry ' gene is obtained from:

Options

A. Agrobacterium tumefaciens
B. Bacillus thuringiensis
C. Rhizobium leguminocearum
D. Rhizobium phaseoli

Answer

To answer the question "Cry ' gene is obtained from:", we need to follow these steps:

### Step 1: Understand what the Cry gene is.
The Cry gene is responsible for producing a protein known as Bt toxin, which is an insecticidal endotoxin.

### Step 2: Identify the source of the Cry gene.
The Cry gene is derived from the bacterium Bacillus thuringiensis (Bt). This bacterium produces the Bt toxin, which is effective against certain insect pests.

### Step 3: Analyze the options provided.
- **Agrobacterium tumefaciens**: This bacterium is known for its role in plant genetic engineering but does not produce the Cry gene.
- **Bacillus thuringiensis**: This is the correct answer as it is the source of the Cry gene.
- **Rhizobium leguminosarum**: This bacterium is involved in nitrogen fixation in legumes and does not produce the Cry gene.
- **Rhizobium fascioli**: Similar to Rhizobium leguminosarum, this bacterium is also involved in nitrogen fixation and is not related to the Cry gene.

### Step 4: Conclude with the correct answer.
Based on the information and analysis, the Cry gene is obtained from **Bacillus thuringiensis**.

### Final Answer:
**Bacillus thuringiensis**

---