Crossing over in diploid organisms is responsible for

Options

A. Deominanee of genes
B. Linkage between genes
C. Recombination of linkage genes
D. Segregation of alleles.

Answer

**Step-by-Step Solution:**

1. **Understanding Crossing Over**:
- Crossing over is a biological process that occurs during meiosis, specifically during the pachytene stage of prophase I. It involves the exchange of genetic material between homologous chromosomes.

2. **Identifying the Context**:
- In diploid organisms, chromosomes exist in pairs (homologous chromosomes). Each pair consists of one chromosome from each parent. During meiosis, these homologous chromosomes can exchange segments of DNA.

3. **Mechanism of Crossing Over**:
- During synapsis, homologous chromosomes align closely together. This close alignment allows for the exchange of genetic material between non-sister chromatids, leading to genetic variation.

4. **Results of Crossing Over**:
- The primary outcome of crossing over is the recombination of linked genes. This means that genes that were previously inherited together can now be inherited in new combinations, leading to increased genetic diversity in the offspring.

5. **Evaluating the Options**:
- Option A (dominance of genes) is incorrect because crossing over does not determine gene dominance.
- Option B (linkage between genes) is also incorrect, as crossing over disrupts linkage.
- Option C (recombination of linkage genes) is correct, as it accurately describes the result of crossing over.
- Option D (segregation of alleles) refers to the separation of alleles during meiosis, which is a different process.

6. **Conclusion**:
- Based on the understanding of crossing over and its effects, the correct answer is **Option C: recombination of linkage genes**.

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