Here's a breakdown:
* Chromosomes: These are thread-like structures made of DNA and proteins. They contain the genetic information of the cell.
* Mitosis: During this process, a single cell divides into two identical daughter cells. Before mitosis, the chromosomes duplicate, creating two identical copies. These copies then separate, ensuring each daughter cell receives a complete set of chromosomes.
* Meiosis: This process produces gametes (sperm and egg cells) with half the number of chromosomes as the parent cell. Before meiosis, chromosomes also duplicate, but then they undergo two rounds of division. In the first division, homologous chromosomes (one from each parent) pair up and exchange genetic material (crossing over) before separating. In the second division, sister chromatids (identical copies of a chromosome) separate, resulting in four gametes, each with half the number of chromosomes as the original cell.
Therefore, chromosomes are the key structures that duplicate and separate during both mitosis and meiosis, ensuring accurate distribution of genetic information to daughter cells and gametes.
