Which of the following defines a chromatid?

A chromatid is defined as one of the identical strands that make up a duplicated chromosome. When a chromosome replicates during the S phase of the cell cycle, it forms two identical structures known as sister chromatids, which are joined at a region called the centromere. Each sister chromatid carries the same genetic information and will separate during cell division, specifically during mitosis or meiosis, ensuring that each new daughter cell receives an identical set of chromosomes.

This definition aligns perfectly with the properties of chromatids, as they play a crucial role in the proper segregation of genetic material during cell division. Understanding that chromatids are part of the structure of chromosomes helps clarify the process of genetic inheritance and cell replication.