Congression is

Options

A. pairing of homologous chromosomes
B. separation of paired chromosomes
C. bringing the chromosomes on equator of spindle apparatus
D. movement of sister chromatids towards the poles

Answer

**Step-by-Step Solution:**

1. **Understanding the Term "Congression":**
- Congression refers to a specific process that occurs during cell division, particularly during mitosis and meiosis.

2. **Identifying the Context of Congression:**
- In the context of cell division, congression involves the alignment of chromosomes. This is crucial for ensuring that chromosomes are properly segregated into daughter cells.

3. **Defining Chromosome Congression:**
- Chromosome congression is the process by which chromosomes align at the spindle apparatus. This alignment occurs at a specific position known as the spindle equator.

4. **Understanding the Spindle Equator:**
- The spindle equator is the imaginary line that is equidistant from the two poles of the spindle apparatus. It is the region where chromosomes line up before being separated into daughter cells.

5. **Evaluating the Options:**
- Option A: Pairing of homologous chromosomes - This is not congression.
- Option B: Separation of paired chromosomes - This occurs after congression.
- Option C: Bringing the chromosomes on equator of spindle apparatus - This accurately describes congression.
- Option D: Movement of sister chromatids toward the poles - This occurs after congression is complete.

6. **Conclusion:**
- The correct answer is Option C: "Bringing the chromosomes on equator of spindle apparatus."

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