Cell Division by Mitosis
Every cell in your body contains a nucleus housing chromosomes made of DNA. Human body cells contain 23 pairs of chromosomes, with each chromosome carrying over 100 genes that determine your unique features. These genes are the instructions that make you who you are!
The cell cycle is the process by which cells reproduce themselves. Mitosis serves three main functions: it allows multicellular organisms like humans and plants to grow and develop, helps organisms repair damaged tissues (like when a broken bone heals), and enables asexual reproduction in some organisms.
During mitosis, the cell goes through a series of organized steps. First, DNA replicates to form two copies of each chromosome. Then the nuclear membrane breaks down, and chromosomes line up across the center of the cell. One set of chromosomes gets pulled to each end of the cell as the nucleus divides. Finally, the cytoplasm and cell membrane divide to form two identical daughter cells.
Remember This! In exams, you might see simplified diagrams of mitosis rather than detailed microscope images. Focus on understanding the sequence of events and the purpose of each stage rather than memorizing exact appearances.