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Before a cell can divide, it must produce a new copy of each of its chromosomes, and it does this during a specific part of interphase called the DNA-synthesis phase, or S phase, of the cell-division cycle; the part of interphase preceding S phase is called Gap 1, or G1, and the part following S phase is called Gap 2, or G2. In a typical higher eucaryotic cell the S phase lasts for about 8 hours. By its end each chromosome has been replicated to produce two complete copies, which remain joined together at their centromeres until the M phase that soon follows. Chromosome duplication requires both the replication of the long DNA molecule in each chromosome and the assembly of a new set of chromosomal proteins onto the DNA to form chromatin.

(copied chromosome)

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A replicated chromosome is a chromosome that has been copied during the S phase of the cell cycle, resulting in two identical sister chromatids joined at the centromere. This duplication ensures that each daughter cell receives a complete set of genetic material during cell division.

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Q: Tell me what a replicated Chromosome?
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