What is the replicated copy of a chromosome called, visible during cell division?

The replicated copy of a chromosome that is visible during cell division is known as a chromatid. When a chromosome duplicates itself in preparation for cell division, it creates two identical copies, which are referred to as sister chromatids. Each chromatid is one half of the duplicated chromosome, and they remain attached to each other at a region called the centromere until they are separated during cell division.

Understanding this concept is crucial because it highlights the organization of genetic material during the process of mitosis or meiosis, ensuring that each daughter cell receives an accurate copy of the genetic information. This structural aspect of chromosomes provides clarity on how genetic information is maintained and distributed in cells. The other terms like chromatin refer to the uncoiled, less condensed form of DNA found during interphase, while the centromere is the specific region where the two sister chromatids are joined together, and sister chromatid is a more specific term referring to each of the two identical copies.