Answer:
1.The cell cycle, or cell-division cycle, is the series of events that take place in a cell that cause it to divide into two daughter cells.
2. In the Picture Linked.
3. Chromosome help ensure that DNA is replicated and distributed appropriately during cell division. Each chromosome has a centromere, which divides the chromosome into two sections – the p (short) arm and the q (long) arm.
4. Mitosis occurs at the sites of growth and development of new tissues. Â Â Â Here are the stage of mitosis Below:
Prophase
This is the initial phase. The chromosomes in the nucleus become visible as thin coiled threads. In animals, the centrosome found in the cytoplasm divides to form two centrioles. The chromosomes become tightly coiled and shorter. From each centriole, fine fibers develop and elongate to form spindle apparatus. The nucleolus becomes dispersed in the nucleus and disappears. The nuclear membrane also break and disappears.
Metaphase
The pairs of chromatids align along the equator of the spindle apparatus and are attached to it at their centromeres.
Anaphase
The centromere of each chromosome splits and the chromatids separate. Each chromatid moves to the opposite poles of the cell. The chromatids appear as V--shaped.
Telophase
The spindle fibers disintegrate and disappear. New nuclear membrane forma around each set of chromatids. A nucleolus develops in the nucleus of each daughter cell. The cytoplasm now divides in a process called cytokinesis. In animals, an invagination develops at the plasmalemma near the equator of the cell.
Relationship between mitosis and cytokinesis:
Mitosis is the division of a nucleus. Cytokinesis is the division of the cytoplasm. If mitosis occurred without cytokinesis, the cell would contain two nuclei and twice the DNA. If cytokinesis occurred without mitosis , one of the new cells would lack DNA and a nucleus altogether.
