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Why is it important for dna to be duplicated before mitosis

User VvdL
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It is important because that's how it will split into two new daughter cells.
User Chad Adams
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If it didn't, one cell would end up with the original DNA, the other wouldn't be a functional cell, because it would lack DNA. If the DNA was split between the two cells, neither cell would have a complete copy.
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User Lepidosteus
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