The function of crossing over is

Options

A. Segregation of alleles
B. Recombination of alleles
C. Segregation of chromosomes
D. Distribution of linked genes.

Answer

### Step-by-Step Text Solution

1. **Understanding Crossing Over**:
- Crossing over is a genetic phenomenon that occurs during meiosis, specifically during the prophase I stage of meiosis.

2. **Location of Crossing Over**:
- It takes place during the pachytene stage of prophase I, where homologous chromosomes pair up.

3. **Mechanism of Crossing Over**:
- During this process, non-sister chromatids of homologous chromosomes exchange segments of genetic material. This exchange is facilitated by an enzyme called recombinase.

4. **Result of Crossing Over**:
- The primary function of crossing over is the recombination of alleles. This means that the genetic material is mixed, leading to new combinations of alleles.

5. **Importance of Crossing Over**:
- The new combinations of alleles created through crossing over contribute to genetic variation in sexually reproducing populations. This variation is essential for evolution and adaptation.

6. **Conclusion**:
- Therefore, the function of crossing over is to facilitate the recombination of alleles, which leads to genetic diversity.