In which of the following organism, genes are found in original arrangement, no recombination.

Options

A. Female Drosophila
B. Male silk worm
C. Male Drosophila
D. None

Answer

To solve the question regarding which organism has genes found in their original arrangement with no recombination, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding the Concept of Recombination**:
- Recombination occurs during meiosis when homologous chromosomes exchange genetic material. This process can lead to new combinations of alleles, which is known as crossing over.

2. **Identifying Complete Linkage**:
- Complete linkage refers to a situation where genes are so closely located on a chromosome that they are inherited together without any recombination. This results in a 0% crossing over frequency.

3. **Analyzing the Options**:
- **Option 1: Female Drosophila**: In females, there can be some recombination due to the presence of two X chromosomes.
- **Option 2: Male Silkworm**: Male silkworms can exhibit recombination as well.
- **Option 3: Male Drosophila**: Male Drosophila (fruit flies) are known for having complete linkage for certain genes, meaning they show 0% crossing over.
- **Option 4: None**: This option suggests that none of the organisms exhibit the required condition.

4. **Conclusion**:
- Based on the analysis, the organism that exhibits genes in their original arrangement with no recombination is **Male Drosophila**. This is due to the complete linkage observed in this organism.

### Final Answer:
**Male Drosophila** is the organism where genes are found in their original arrangement with no recombination.

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