A replicated chromosome consists of two identical sister chromatids.
During the process of cell division, specifically during the S phase of the cell cycle, each chromosome is duplicated. This duplication results in two copies of each chromosome, which are known as sister chromatids, joined together at a region called the centromere. Thus, when we refer to a replicated chromosome, we are actually speaking about the structure that contains these two sister chromatids. This configuration is crucial for ensuring that each daughter cell receives an exact copy of the genetic information during cell division.