Complete linkage is found in

Options

A. Birds
B. Snakes
C. Female Drosophila
D. Male Drosphila

Answer

**Step-by-Step Solution:**

1. **Understanding Complete Linkage**:
- Complete linkage refers to a genetic scenario where two genes are located very close to each other on the same chromosome. As a result, they tend to be inherited together and do not undergo recombination during meiosis.

2. **Identifying Organisms**:
- The question provides four options: birds, snakes, female Drosophila, and male Drosophila. We need to analyze which of these organisms exhibits complete linkage.

3. **Analyzing Each Option**:
- **Birds**: Birds generally exhibit a variety of genetic recombination, and complete linkage is not a characteristic feature.
- **Snakes**: Similar to birds, snakes also show genetic recombination, making complete linkage unlikely.
- **Female Drosophila**: In female Drosophila, crossing over can occur, which means that complete linkage is not typically observed.
- **Male Drosophila**: In male Drosophila, there is a complete absence of crossing over. This means that genes located close together on the same chromosome are inherited together without recombination, indicating complete linkage.

4. **Conclusion**:
- Based on the analysis, the organism where complete linkage is found is **male Drosophila**.

**Final Answer**: Complete linkage is found in male Drosophila.

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