Given-
1. Chromatid
2. Monad
3. Dyad
4. Daughter chromosome
The correct sequence in cell division is :

Options

A. 1, 2, 3, 4
B. 2, 3, 1, 4
C. 3, 2, 1, 4
D. 4, 3, 2, 1

Answer

To determine the correct sequence in cell division from the given terms (chromatid, monad, dyad, and daughter chromosome), we need to understand the definitions and the order of events during cell division.

### Step-by-Step Solution:

1. **Understand the Terms**:
- **Monad**: This refers to a single chromosome that is not yet duplicated. In the context of cell division, it represents the state of a chromosome before DNA replication.
- **Dyad**: This is a term used for a chromosome that has been replicated and consists of two sister chromatids joined at the centromere. This occurs after the S phase of the cell cycle.
- **Chromatid**: This refers to one of the two identical halves of a replicated chromosome. After the S phase, each dyad consists of two chromatids.
- **Daughter Chromosome**: These are the chromosomes that result after the separation of chromatids during cell division (anaphase). Each daughter chromosome is a monad again after separation.

2. **Sequence of Events in Cell Division**:
- **First**: The cell starts with a **monad** (1), which is a single chromosome.
- **Second**: During the S phase of the cell cycle, the monad replicates to form a **dyad** (2), consisting of two sister chromatids.
- **Third**: The dyad consists of two **chromatids** (3) that are still connected at the centromere.
- **Fourth**: During anaphase of cell division, the chromatids are pulled apart, resulting in **daughter chromosomes** (4).

3. **Correct Sequence**:
- Therefore, the correct order is:
1. Monad (1)
2. Dyad (2)
3. Chromatid (3)
4. Daughter Chromosome (4)

Thus, the correct sequence in cell division is: **Monad → Dyad → Chromatid → Daughter Chromosome**.

### Final Answer:
1. Monad
2. Dyad
3. Chromatid
4. Daughter Chromosome