Identify and write the correct statement:

Options

A. Drosophila male has one X and one Y chromosome.
B. Drosophila male has two X chromosomes.
C. Drosophila male has one Z and one W chromosome.
D. Drosophila male has two Z chromosomes.

Explanation

To solve the question, we need to identify the correct statement regarding the chromosomal composition of male Drosophila (fruit flies). Let's break down the information step by step.

### Step-by-Step Solution:

1. **Understanding Drosophila**:
- Drosophila melanogaster, commonly known as the fruit fly, is a model organism in genetics. It is widely used in biological research due to its simple genetic structure and short life cycle.

2. **Chromosomal Composition**:
- In Drosophila, males and females have different chromosomal compositions. Males have one X chromosome and one Y chromosome, while females have two X chromosomes.

3. **Analyzing the Options**:
- **Option A**: "Drosophila male has one X and one Y chromosome."
- This statement is correct as it accurately describes the male Drosophila's chromosomal makeup.
- **Option B**: "Drosophila male has two X chromosomes."
- This statement is incorrect because males do not have two X chromosomes; they have one X and one Y.
- **Option C**: "Drosophila male has one Z and one W chromosome."
- This statement is incorrect; Drosophila does not have Z and W chromosomes.
- **Option D**: "Drosophila male has two Z chromosomes."
- This statement is also incorrect for the same reason as option C.

4. **Conclusion**:
- The correct statement is **Option A**: "Drosophila male has one X and one Y chromosome."

### Final Answer:
- The correct statement is: **Drosophila male has one X and one Y chromosome.** (Option A)