Whereas the number of chromosomes is reduced to half in first reduction division of meiosis, then what is the need for second mitotic division

Options

A. The division is required for the formation of four gametes
B. Division ensures equal distribution of haploid chromosomes
C. Division ensures equal distribution of genes on chromosomes
D. Division is required for segregation of replicated, chromosomes

Answer

To answer the question regarding the need for the second mitotic division in meiosis, we can break down the explanation into clear steps:

### Step-by-Step Solution:

1. **Understanding Meiosis**: Meiosis is a specialized form of cell division that occurs in germ cells to produce gametes (sperm and eggs). It consists of two main stages: Meiosis I and Meiosis II.

2. **First Division (Meiosis I)**: The first division, known as the reductional division, reduces the chromosome number by half. This is crucial because it transforms the diploid (2n) germ cells into haploid (n) gametes. However, during this division, the chromosomes are not fully separated; instead, homologous chromosomes are separated.

3. **Chromosome Replication**: Before meiosis begins, during the S phase of interphase, the DNA is replicated. This means that each chromosome consists of two sister chromatids.

4. **Second Division (Meiosis II)**: The second division, known as the equational division, resembles mitosis. It is necessary to separate the sister chromatids that were not separated during Meiosis I. This ensures that each gamete receives one copy of each chromosome.

5. **Equal Distribution**: The second division is essential for the equal distribution of the replicated chromosomes to the daughter cells. Without this division, the gametes would not have the correct number of chromosomes, leading to genetic imbalances.

6. **Conclusion**: Therefore, the second mitotic division (Meiosis II) is required for the segregation of the replicated chromosomes, ensuring that each gamete ends up with a complete set of haploid chromosomes.

### Final Answer:
The need for the second mitotic division in meiosis is to ensure the segregation of the replicated chromosomes, allowing for the proper distribution of genetic material into the resulting gametes.

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