Which of the following is correct chronological order of the division taking place through an apical or embryo cell to a sixteen cell stage

Options

A. Vertical division______ Transverse division ____ Division at right angles to both thhe privious divisions____ Periclinal division
B. Vertical division___ Vertical division at right angles to the first division___Division at right angles to both the privious divisions____ Periclinal divisions
C. Vertical division ____ Transverse division ____ Periclinal division
D. Vertical division___ Vertical division at right angles to the first division___ at right angles to the first division___ Transverse division___ Periclinal division.

Answer

To determine the correct chronological order of divisions taking place through an apical or embryo cell to a sixteen-cell stage, we need to understand the stages of early embryonic development, specifically the cleavage stages.

### Step-by-Step Solution:

1. **Start with the Zygote**: The process begins with the fertilized egg known as the zygote. This is the initial single-cell stage after fertilization.

2. **First Division (Vertical Division)**: The zygote undergoes its first division, which is a vertical division, resulting in the formation of the 2-cell stage.

3. **Second Division (Vertical Division)**: The 2-cell stage then undergoes another vertical division, leading to the 4-cell stage.

4. **Third Division (Transverse Division)**: The 4-cell stage undergoes a transverse division (horizontal division), resulting in the 8-cell stage.

5. **Fourth Division (Peritlinal Division)**: Finally, the 8-cell stage undergoes a peritlinal division, which occurs parallel to the plane of cell division, resulting in the 16-cell stage.

### Summary of the Order:
- Zygote → 2-cell stage (Vertical Division)
- 2-cell stage → 4-cell stage (Vertical Division)
- 4-cell stage → 8-cell stage (Transverse Division)
- 8-cell stage → 16-cell stage (Peritlinal Division)

### Correct Order:
The correct chronological order of divisions is:
1. Vertical Division (Zygote to 2-cell)
2. Vertical Division (2-cell to 4-cell)
3. Transverse Division (4-cell to 8-cell)
4. Peritlinal Division (8-cell to 16-cell)

### Final Answer:
The correct option is the one that states: "Vertical Division, Vertical Division, Transverse Division, Peritlinal Division."

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