In Drosophila the X/A ratio determines the sexual morphology. Find the incorrect match among the following -

Options

A. 3 X / 2A - Super female
B. 2 X / 3A - Female
C. X / 2A - Male
D. X / 3A - Super male

Answer

To solve the question regarding the X/A ratio determining sexual morphology in Drosophila and identifying the incorrect match, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the X/A Ratio**:
- The X/A ratio in Drosophila refers to the ratio of X chromosomes (X) to the number of sets of autosomes (A). This ratio is crucial in determining the sexual phenotype of the organism.

2. **Identify the Ratios for Different Morphologies**:
- **Super Female**: The X/A ratio is 3/2 (1.5). This indicates a super female phenotype.
- **Female**: The X/A ratio is 1/1 (1.0). This indicates a normal female phenotype.
- **Male**: The X/A ratio is 1/2 (0.5). This indicates a male phenotype.
- **Super Male**: The X/A ratio is 1/3 (approximately 0.33). This indicates a super male phenotype.

3. **Match the Given Ratios with Their Corresponding Morphologies**:
- Check each option provided in the question to see if they align with the known ratios:
- Super Female: 3/2
- Female: 1/1
- Male: 1/2
- Super Male: 1/3

4. **Identify the Incorrect Match**:
- Compare the provided options with the established ratios. The incorrect match will be the one that does not correspond to the expected X/A ratio for the given sexual morphology.

5. **Conclusion**:
- After analyzing the options, it is determined that option 2 does not match the expected ratio for the morphology it is paired with. Therefore, option 2 is the incorrect match.

### Final Answer:
The incorrect match among the options provided is **option 2**.

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