Interphase
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Chromosomes duplicate during the S phase of interphase in the cell cycle. This is when DNA replication occurs, resulting in each chromosome being duplicated to form two sister chromatids held together at the centromere.
Chromosomes are duplicated during the S phase of the cell cycle, which occurs during interphase. This is when DNA replication takes place to ensure that each daughter cell receives a complete set of chromosomes during cell division.
DNA is replicated during interphase, and chromosomes form or condense during the prophase. So the genes and chromosomes are duplicated at the beginning of mitosis, during the interphase, although you can't see them as chromosomes until the prophase, before the cell splits.
Chromosomes are duplicated during the S phase of the cell cycle, which occurs before cell division. This process ensures each daughter cell receives a complete set of chromosomes. Duplication involves making an identical copy of each chromosome, including its genes and DNA.