The polytene chromosomes were discovered for the first time in

Options

A. Drosophila
B. Musca domestica
C. Chironomus
D. Musca nebula

Answer

**Step-by-Step Solution:**

1. **Understanding Polytene Chromosomes**:
- Polytene chromosomes are large chromosomes that consist of many DNA strands. The term "polytene" comes from "poly," meaning many, and "tene," meaning strands.

2. **Location of Polytene Chromosomes**:
- These chromosomes are primarily found in the salivary glands of certain organisms.

3. **Historical Discovery**:
- The first discovery of polytene chromosomes occurred in the year 1880.

4. **Discoverer**:
- The scientist who first discovered polytene chromosomes was Balbiani.

5. **Organism in Which They Were Discovered**:
- The specific organism in which polytene chromosomes were first identified is Chironomus, a genus of non-biting midges.

6. **Final Answer**:
- Therefore, the correct answer to the question is that polytene chromosomes were discovered for the first time in Chironomus.

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