The document discusses the process of cell division and the cell cycle. It explains that cell division allows cells to reproduce, grow, and repair. The cell cycle consists of interphase, where the cell grows and prepares for division, mitosis where the cell nucleus and genetic material divide, and cytokinesis where the cytoplasmic contents are split into two daughter cells. The DNA contains instructions that direct each phase of the cell cycle.

1. Cell Division Reproduction Growth Repair Why do cells divide? How does the cell know how to divide? The DNA has the instructions for all of the cell’s activities.

2. Cell Cycle Interphase - Preparation Mitosis – Cell division Cytokinesis – Splitting Adult human cell: ~24 hrs 18-20 hours in interphase 2 hours in mitosis Embryonic cells: 30 min. 3 Parts How long does it take? The sequence of development and division of a cell

3. Interphase Cell doubles in size DNA replicates Organelles double in number What happens

4. Mitosis: PROPHASE DNA forms chromosomes Spindle forms Centrioles move toward opposite poles Nuclear membrane begins to disappear What happens

5. Mitosis: METAPHASE Nucleus has disappeared completely Chromosomes line up in the middle of the cell “equator” What happens

6. Mitosis: ANAPHASE Centromeres divide Chromatids separate and move to opposite poles What happens

7. Mitosis: TELOPHASE Nuclear membrane forms around each group of chromosomes Chromosomes unwind Cytokinesis begins What happens

8. Cytokinesis What happens Cytoplasm divides One cell becomes 2 cells