which model accuratey represents the process of mitosis?
The most commonly accepted model that accurately represents the process of mitosis is the "classical" or "canonical" model of mitosis. In this model, mitosis is divided into several distinct phases:
1. Interphase: The cell prepares for mitosis by undergoing growth, DNA replication, and organelle duplication.
2. Prophase: The chromatin condenses into chromosomes, the nuclear membrane disintegrates, and the spindle apparatus starts to form.
3. Prometaphase: The spindle apparatus fully forms, and kinetochore proteins attach to the centromere of each chromosome. The chromosomes start to move towards the center of the cell.
4. Metaphase: The chromosomes align along the equatorial plane of the cell, forming a metaphase plate.
5. Anaphase: The sister chromatids of each chromosome separate and move towards opposite poles of the cell. The spindle fibers continue to elongate, separating the chromatids further.
6. Telophase: The separated chromatids reach the opposite poles of the cell, the spindle apparatus disintegrates, and the nuclear membrane re-forms around each set of chromosomes.
7. Cytokinesis: The cell membrane pinches in or a cell wall forms, dividing the cytoplasm into two daughter cells. This results in the completion of cell division.
This classical model accurately represents the sequence of events during mitosis and helps understand the distribution of genetic material from one cell to two daughter cells. However, it is important to note that there may be variations or additional details in different organisms and cell types.