If an x represents a replicated chromosome, how many chromatids of which type does it represent?

Replicated chromosome contains two sister chromatides

Explanation:

Before mitosis (cell division) DNA (chromosomes) must be replicated (during the S phase of interphase) so that each daughter cell receive a complete copy of the DNA. As a result of DNA replication, the two identical chromosomes will be formed and they are called  sister chromatids. Two sister chromatides are joined to the original chromosome by a single centromere.

During the anaphase of mitosis, these chromatids will separate longitudinally to become individual chromosomes.

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