can someone explain DNA replication please??

Answer 1

Here's a great animation that helps explain it: http://www.johnkyrk.com/DNAreplication.html

Answer 2

DNA replication or DNA synthesis is the process of copying a double-stranded DNA strand in a cell, prior to cell division. In eukaryotes, this is during the S phase of the cell cycle, preceding mitosis and meiosis. The two resulting double strands are identical (if the replication went well), and each of them consists of one original and one newly synthesized strand. This is called semiconservative replication. The process of replication consists of three steps, initiation, elongation and termination. Artificial DNA replication is carried out through polymerase chain reaction.

Answer 3

The DNA molecule is basically a ladder, that is twisted into a spiral. Each rung of the ladder is composed of a union of two base pairs, one from each side of the ladder. There are only 4 (adenine, guanine, thymine, cytosine). Adenine can only join with thymine, and guanine can only join with cytosine. When DNA replicates, the bonds between adenine-thymine and guanine-cytosine is broken, much like a zipper that is unzipped. In the nucleus of the cell containing the separated DNA strands, there are free base molecules floating around. The free adenines will hook up with the thymines, the free thymines will hook up with the adenines. Similarly the free guanines will hook up with the cytosines...etc. When both broken strands of the DNA molecule have completely hooked up with the appropriate bases, you now have two identical DNA molecules, both are copies of the original. The entire process is both elegant and simple.