File Name: cell division mitosis and meiosis notes .zip
What is mitosis?
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Cell division gives rise to genetically identical cells in which the total number of chromosomes is maintained. The process of mitosis is divided into stages corresponding to the completion of one set of activities and the start of the next. These stages are prophase , prometaphase , metaphase , anaphase , and telophase. During mitosis, the chromosomes, which have already duplicated, condense and attach to spindle fibers that pull one copy of each chromosome to opposite sides of the cell. The rest of the cell may then continue to divide by cytokinesis to produce two daughter cells.
According to the theory old cells split into new cells and the formation of new cells is known as cell division or cell production. This was firstly observed by Flemming in but an extensive in details was given by Belar in Amitosis: This cell division takes place in less developed cell of unicellular organism and firstly nucleus of the cell is divided and then later cytoplasm, ultimately two new cells are formed.
The sequence of events by which a cell duplicates its genome, synthesis the other constitutents of the cell and eventually divides into two daughter cells.
Nuclear division divides the genetic material in the nucleus, while cytokinesis divides the cytoplasm. There are two kinds of nuclear division—mitosis and meiosis. Mitosis divides the nucleus so that both daughter cells are genetically identical. In contrast, meiosis is a reduction division, producing daughter cells that contain half the genetic information of the parent cell. Each chromatid consists of a single, tightly coiled molecule of DNA.