The cell will have 6 replicated chromosomes after chromosome replication.

Key idea

  • An unreplicated chromosome is a single DNA molecule with its associated proteins, counted as one chromosome.
  • During S phase, each chromosome is copied, forming two sister chromatids joined at a centromere, but this structure is still counted as one replicated chromosome.

So if the cell starts with 6 unreplicated chromosomes, after DNA replication it has 6 replicated chromosomes, each made of two sister chromatids.

Quick visual story

  • Before replication: 6 single rods (6 unreplicated chromosomes).
  • After replication: 6 X‑shaped structures, each with 2 identical arms (sister chromatids), but still counted as 6 chromosomes, just now replicated.

Answer: 6 replicated chromosomes.

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