How many linkage groups are present in male Drosophila ?

Options

A. Four
B. Five
C. Eight
D. Three

Answer

To determine how many linkage groups are present in male Drosophila, we can follow these steps:

### Step-by-Step Solution:

1. **Understand Linkage Groups**:
- A linkage group consists of all the genes located on a single chromosome. These genes are inherited together as they are physically linked on the chromosome.

2. **Identify the Chromosome Number in Drosophila**:
- Drosophila (fruit fly) is a diploid organism, meaning it has two sets of chromosomes. The total number of chromosomes in male Drosophila is 8 (4 pairs).

3. **Determine the Haploid Set**:
- To calculate the number of linkage groups, we need to consider the haploid set of chromosomes. The haploid set is the number of chromosomes in a single set, which is half of the diploid number.
- For Drosophila, the haploid number (n) is 4 (since the diploid number is 8).

4. **Conclusion**:
- Since each chromosome represents a linkage group, the number of linkage groups in male Drosophila is equal to the haploid number of chromosomes.
- Therefore, the number of linkage groups in male Drosophila is **4**.

### Final Answer:
The number of linkage groups present in male Drosophila is **4**.

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