dna replication?

Answer 1

You can write a book about it. What did you want to know specifically?

Answer 2

DNA is copied to make two identical DNA molecules.

It requires enzymes and spare nucleotides which are in the nucleus.

1. DNA unwinds and unzips between the nitrogen bases.
2. Enzymes match new nucleotides to the unpaired nitrogen bases on the two original strands.
3. When all the bases have been matched with new nucleotides and all the new bonds have been made, the two new DNA molecules wind up again.

The new DNA molecules are identical because the two strands of the original DNA serve as templates to form the new ones. Each new molecules has one original strand and one new strand.