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The cell cycle and mitosis
Cells constantly reproduce exact duplicates of themselves. Why? Replacement Repair Growth
Cells must make an exact copy of their DNA DNA is the blueprint of the cell and is found in the nucleus
Cell growth and division happens in a series of recognizable steps called the Cell Cycle Rephrase: what is the cell cycle?
Cell cycle has three phases 1. Interphase –Cell growth –DNA replication occurs 2. Mitosis –Nuclear division –2 daughter cells formed, each has identical DNA 3. Cytokinesis –2 identical cells Cell cycle Interphase (DNA duplication) Mitosis (Nuclear Division) Cytokinesis (cytoplasm division)
DNA forms chromosomes- For most of the cells life, DNA is arranged loosely in the form of chromatin During mitosis DNA condenses into chromosomes
Interphase Longest phase Cell grows Chromosomes are duplicated- each duplicate is called a sister chromatid
Prophase Nuclear envelope breaks down Sister chromatids joined at centromere Centrioles move to opposite ends and the spindle fibers form between them
Metaphase Short Spindle fibers attach to centromere Sister chromatids line up along midline
Anaphase Sister chromatids are pulled apart by the spindle fibers
Telophase Final phase of mitosis- opposite of prophase Chromatids reach opposite poles Nuclear envelope reforms Chromosomes unwind
Cytokinesis Cytoplasm division Cytokinesis differs between plants and animals- why?
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