what is importance of dna copy and how it cause variation
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Cell replication is the process of going from one cell to two cells. Since the original single cell had only one set of DNA, it needs to copy it so that both resulting cells have the DNA they need to survive. Reproduction of multicellular organisms is essentially a lot of cell replications, followed by differentiation of those cells.
You can read about the difference between asexual (mitotic) and sexual (meiotic) reproduction here.