In Drosophila, sex is determined by the ratio of X-chromosomes, to the number of

Options

A. Autosomes in a cell
B. Chromosomes of a haploid set
C. Haploid sets of autosomes
D. Autosomes of a haploid set

Answer

To solve the question regarding sex determination in Drosophila, we need to understand the genetic basis of how sex is determined in this organism. Here’s a step-by-step solution:

### Step-by-Step Solution:

1. **Understanding Drosophila Genetics**:
- Drosophila melanogaster, commonly known as fruit flies, have a specific system for sex determination that is based on the ratio of X chromosomes to autosomes.

2. **Identify the Components**:
- In Drosophila, sex is determined by the number of X chromosomes (X) and the number of complete sets of autosomes (A). Autosomes are non-sex chromosomes.

3. **Ratio Calculation**:
- The sex of the individual is determined by the ratio of X chromosomes to the number of haploid sets of autosomes. In Drosophila, each individual has two sets of autosomes (one from each parent), so the number of haploid sets of autosomes is 1.

4. **Determine the Sex**:
- If the ratio of X to A is 1 (X: A = 1:1), the individual is female.
- If the ratio of X to A is 0.5 (X: A = 1:2), the individual is male.

5. **Conclusion**:
- Therefore, the correct answer to the question is that in Drosophila, sex is determined by the ratio of X chromosomes to the number of haploid sets of autosomes.

### Final Answer:
In Drosophila, sex is determined by the ratio of X chromosomes to the number of haploid sets of autosomes.