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DNA replication occurs during the synthesis (S) phase of mitosis with the use of different replicating factors such as DNA Helicase. It starts the replication by "unzipping" and separating the two helices of DNA (DNA is made up of a double helix, like a twisted ladder). Each strand is duplicated individually with the use of DNA Polymerase. This is called semi-conservative replication because the new DNA created is one strand half old, and one strand half new. It adds nucleotides across from the old strand, matching A-T, and G-C. By the end of the S phase, the cell is getting ready to divide completely (mitosis or meiosis). Mitosis results in exact duplicates whereas crossing over, a.k.a. synapsis, occurs during Prophase 1, or diplotene, in the meiotic process.

A more detailed description is best found in a Molecular Biology textbook or a Cell Biology textbook.

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Q: Process in which DNA molecules form exact duplicates?
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