Drosophila melanogaster has :

Options

A. 2 pairs of autosomes nad 1 pair of sex chromosomes
B. 3 pairs of autosomes and 3 pairs of sex chromosomes
C. 1 pairs of autosomes and 3 pairs of sex chromosomes
D. 3 pairs of autosomes and 1 pairs of sex chromosomes

Answer

To determine the chromosomal composition of Drosophila melanogaster, we can follow these steps:

### Step 1: Understand Chromosome Types
- Chromosomes can be classified into two main types: autosomes and sex chromosomes.
- Autosomes are non-sex chromosomes, while sex chromosomes determine the sex of an organism.

### Step 2: Identify the Total Number of Chromosome Pairs
- Drosophila melanogaster, commonly known as the fruit fly, has a total of 4 pairs of chromosomes.

### Step 3: Determine the Distribution of Chromosome Types
- Out of the total 4 pairs, we need to identify how many are autosomes and how many are sex chromosomes.
- It is known that Drosophila has 3 pairs of autosomes and 1 pair of sex chromosomes.

### Step 4: Confirm the Correct Option
- Based on the distribution, the correct answer is that Drosophila melanogaster has 3 pairs of autosomes and 1 pair of sex chromosomes.

### Final Answer
Drosophila melanogaster has 3 pairs of autosomes and 1 pair of sex chromosomes.

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