DNA duplication occurs at

Options

A. Meisosis-II
B. Mitotic interphase
C. Mitosis only
D. meisosis and mitosis both

Answer

**Step-by-Step Solution:**

1. **Understanding DNA Duplication**: DNA duplication, also known as DNA replication, is the process by which a cell makes an exact copy of its DNA. This is crucial for cell division, as each daughter cell needs to receive a complete set of genetic information.

2. **Identifying the Types of Cell Division**: There are two main types of cell division: mitosis and meiosis.
- **Mitosis**: This is known as equational division, where one parent cell divides to produce two genetically identical daughter cells.
- **Meiosis**: This is known as reductional division, which results in four genetically diverse daughter cells, each with half the number of chromosomes of the parent cell.

3. **DNA Duplication in Mitosis**: During mitosis, DNA replication occurs prior to the division. This ensures that each daughter cell receives an identical copy of the DNA.

4. **DNA Duplication in Meiosis**: Similarly, in meiosis, DNA replication also occurs. This is necessary to form two identical sister chromatids from each chromosome, which will later be separated into different gametes.

5. **Conclusion**: Since DNA duplication occurs in both mitosis and meiosis, the correct answer to the question is that DNA duplication occurs at both meiosis and mitosis.

**Final Answer**: DNA duplication occurs at both meiosis and mitosis (Option D).

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