What is the first step in mitosis?

Mitosis is a process of cell division that ensures the equal distribution of genetic material into two daughter cells. The first step in this process is prophase. During prophase, several key changes occur: the chromatin condenses into visible chromosomes, each consisting of two sister chromatids joined at the centromere. Additionally, the nucleolus begins to disappear, and the mitotic spindle starts to form as the centrosomes move toward opposite poles of the cell. This sets the stage for the subsequent phases of mitosis, where the chromosomes will align and separate correctly.

Understanding prophase is essential, as it is during this stage that the groundwork for successful cell division is laid. The transformations that occur in prophase are crucial for ensuring that the genetic material is organized and properly managed for the later steps of mitosis, making it a fundamental cornerstone of the entire process.