Question

Newly formed dna copies may not be identical at times . Give reason

Answer 1

DNA Polymerase is the group of enzyme that is critical in the DNA replication that is in the process where new DNA copies are made. 

But as any enzyme, DNA polymerase is not 100% accurate. Fidelity or error in DNA replication can cuase fatal mutations and may result in serious disease or mortality. 

To avoid these errors Polymerase usually have exonuclease activity in which DNA pair mismatch is identified and repaired. But even with this function, their exists some % errors which is about $10^{-8}$ . 

Due to this fact, you may observe that new DNA copies are not 100% identical. 

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Answer 2

The DNA in the cell makes proteins, if the information is different and is not identical to a DNA, different proteins will be made. Cells use chemical reactions for DNA while replicating them and in the process of copying DNA, it will have variations every time. So the replication can be identical but they won't be as similar to the original.