When a cell is dividing, the nucleus forms what structure?

During cell division, specifically in the phases of mitosis and meiosis, the genetic material in the nucleus condenses to form chromosomes. This process allows for the accurate segregation of DNA into daughter cells. Chromosomes are made up of chromatin, which is a complex of DNA and proteins. As the cell prepares to divide, the chromatin tightens and coils into visible structures known as chromosomes, ensuring that each daughter cell receives an identical set of genetic information.

The formation of chromosomes is essential for organized and efficient cell division. Each chromosome consists of two sister chromatids joined at a region called the centromere, which will later separate during the division process. Understanding this fundamental aspect of cell biology is crucial for grasping the mechanisms of inheritance and cell function in living organisms.