' Cells use chemical reactions to build their DNA. This creates 2 copies of the DNA in a reproducing cell, and they will need to be separated from each other. However keeping one copy of DNA in the original cel and simply pushing the other one out would not work,because the copy pushed out would not have life processes. Therefore, DNA copying is accompanied by the creation of cellular apparatus, and then the DNA copies separate , each with its own cellular apparatus. Effectively a cell divides to give rise to 2 new cells' .
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​Please find below the solution to the asked query
Let us start with cell cycle.
Cell cycle refers to the sequence of events by which a cell duplicates its genome, synthesises other cell constituents, and eventually divides into two daughter cells. The events of the cell cycle are under genetic control. Phases of the cell cycle are:
After copying DNA, the cell normally divides either by mitosis or meiosis. The DNA duplication is followed by formation of two nuclei in a cell called karyokinesis. This is followed by cytoplasm division called cytokinesis that results in the formation two separate cells.
Just DNA copying in dividing cells is not sufficient for continuity of life because an eukaryotic chromosomes are made of complex of DNA and associated protein. This associated proteins controls gene activity and maintain the structure of the chromosome. A segment along the DNA known as gene encodes instructions that allow a cell to produce a specific product. Gene activity requires other steps like transcription and translation in order synthesise and expression of proteins. So just copying of DNA alone is not sufficient to maintain the continuity of life as the passing on of the copied DNA to the next generation is also mandatory.
After making DNA it cannot be thrown out of cell, it need to be kept with all the cellular apparatus (Cellular apparatus includes all the parts of the cell with in the cell membrane. The cell organelles such as mitochondria, ribosomes, ER, etc.).
So cell divides and form a new daughter cell so that it effectively performs it's life processes.
For example, a parent cell of amoeba will be able to produce two daughter cells with same number chromosomes or DNA to that of parent cell only when it produces another copy of its DNA by replication process. During reproduction the DNA in the nucleus replicates itself to produce the another set of chromosomes or DNA. Then nucleus and cytoplasm divides and two daughter cells of amoeba are produced. Each cell then receives an equal number of the chromosomes or DNA. Thus characters from parent amoebic cell are transferred to daughter cells due to replication of DNA.
Hope it is clear.
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