After replication, what are the two copies of a chromosome called?

After replication, the two copies of a chromosome are referred to as chromatids. Specifically, they are known as sister chromatids when they are joined together at a region called the centromere. During the cell division processes, these chromatids are separated to ensure that each new daughter cell receives an identical set of chromosomes.

Chromatin, on the other hand, describes the uncondensed form of DNA found in the nucleus during interphase, while the term chromosome applies to the tightly coiled structures that are visible during cell division. The centromere is a specific part of the chromosome that links the two sister chromatids but is not used to describe the copies themselves. Understanding these definitions is important for recognizing the roles of different components during cell division and the organization of genetic material.