Which one ensures maintenance of chromosome number generation after generation ?

Options

A. Mitosis
B. Meiosis
C. Splicing
D. Metamorphosis

Answer

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks which process ensures that the number of chromosomes remains constant from one generation to the next.

2. **Identifying the Key Processes**: In sexual reproduction, there are two main processes involved: meiosis and mitosis. Mitosis is responsible for cell division and growth, while meiosis is specifically involved in the formation of gametes (sperm and egg cells).

3. **Explaining Meiosis**: Meiosis is known as reductional division. It reduces the chromosome number by half. For example, if the parent organisms (male and female) are diploid (2n), meiosis will produce gametes that are haploid (n).

4. **Formation of Zygote**: When the male and female gametes fuse during fertilization, they form a zygote that is diploid (2n). This zygote will then develop into an organism, maintaining the chromosome number consistent with its parents.

5. **Conclusion**: Therefore, meiosis is the process that ensures the maintenance of chromosome number generation after generation. It prevents the doubling of chromosome number with each generation.

6. **Eliminating Other Options**:
- Mitosis is an equational division that does not reduce chromosome number; it maintains the same number of chromosomes in daughter cells.
- Splicing refers to the removal of introns from RNA and is unrelated to chromosome number.
- Metamorphosis is a developmental process and does not pertain to chromosome maintenance.

7. **Final Answer**: The correct answer to the question is **meiosis**.

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