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Mr. Altorfer Science The Cell Cycle Pages 98 to 101 The Cell Cycle Cell Cycle- The life cycle of a cell. – The cell cycle begins when the cell is formed and ends when the cell divides and forms new cells. – Before a cell can divide, it must make a copy of its deoxyribonucleic acid (DNA) – DNA is found in your chromosomes. – DNA is your genes or hereditary material. The Cell Cycle Chromosomes- Structures found in the nucleus of a cell that contain your DNA and your genes (hereditary material) Humans have 23 pairs of chromosomes or 46 chromosomes. Each cell in your body has 46 chromosomes that can be found in the nucleus of your cells. Sex Cells, such as sperm and eggs only have 23 chromosomes. Think about it…it makes sense. Making More Eukaryotic Cells Eukaryotic cells divide in three stages: – Interphase: The cell grows and copies its organelles and chromosomes. – Mitosis: The cell divides the genetic material between two cells. Mitosis is divided into four stages: (Prophase, Metaphase, Anaphase, Telophase) – Cytokinesis: The division of the cytoplasm to create two new daughter cells. Mitosis Mitosis ensures that each new cell receives a copy of each chromosome. – See mitosis handout for the stages of mitosis.