Question

describe the stages of mitosis

Answer 1

Prophase -Prophase is the first stage of cell division in both mitosis and meiosis. Beginning after interphase, DNA has already been replicated when the cell enters prophase. The main occurrences in prophase are the condensation of the chromatin and the disappearance of the nucleolus

Anaphase-Anaphase, is the stage of mitosis after the metaphase when replicated chromosomes are split and the daughter chromatids are moved to opposite poles of the cell. Chromosomes also reach their overall maximum condensation in late anaphase, to help chromosome segregation and the re-formation of the nucleus

Telophase-Telophase is technically the final stage of mitosis. Its name derives from the latin word telos which means end. During this phase, the sister chromatids reach opposite poles. The small nuclear vesicles in the cell begin to re-form around the group of chromosomes at each end.

Metaphase-Metaphase is a stage of mitosis in the eukaryotic cell cycle in which chromosomes are at their second-most condensed and coiled stage. These chromosomes, carrying genetic information, align in the equator of the cell before being separated into each of the two daughter cells


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Answer 2

Answer: There are four stages in Mitosis (apart from Interphase) - Prophase, Metaphase, Anaphase, and Telophase.

Explanation: Mitosis is a type of cell division in which two daughter cells are produced from a single cell. They both have the identical number of chromosomes as the parent cell, hence known as equational cell division. The interphase is a preparatory phase for the cells about to undergo cell division before entering the following phases.    

• Prophase - Chromosomes shorten, thicken and divide longitudinally into two chromatids which are joined at a point called the centromere. The centriole in the animal cell divides into two and moves to the opposite ends of the cell. There they form spindle fibers.
• Metaphase - The chromosomes in this stage move and align themselves on the equator of the spindle. They form a plate-like structure called metaphase plate or equatorial plate. This stage of mitosis is very prominent and can be observed closely under the microscope.
• Anaphase - Here, the centromere splits, each having one of the two chromatids known as sister chromatids or daughter chromosomes. They start moving towards the opposite poles due to the contraction of spindle fibers.
• Telophase - The sister chromatids at the opposite poles starts uncoiling and elongating. The nuclear membrane and nucleus start to reappear while the spindle fibers disappear.

This is called karyokinesis (division of nucleus). It is followed by cytokinesis (division of cytoplasm) takes place. Cytokinesis in plant cells takes place by the formation of a cell plate while that in animal cells takes by the formation of a furrow or constriction.