Transcript Cell cycle
Cell Division Biology HW-VOCAB QUIZ TOMORROW 1. TAKE OUT NOTES Cell cycle-process from start to finish Cell division/cell cycle-Interphase through Cytokinesis Mitosis (M phase) Prophase through Telophase Only divides the nucleus NOT the whole cell Where does the cell cycle/division occur? All somatic (body) cells Creates cells that are genetically the same Identical DNA interphase Interphase-most common and longest G1-cell growth and development cell doing the cell’s job S-DNA synthesis chromatin is copied to make two strands, one for each new cell G2-more cell growth and development G0-cell exits the cell cycle and rests Nervous cells are in G0 prophase prophase Chromatin thickens to become chromosomes (now visible) Centrioles (plant cells do not have these) move to the poles of the cell Chromosomes attach to the newly formed spindle fibers Nucleus dissolves metaphase Metaphase (m for middle of the cell) Chromosomes line up along equator of cell anaphase Anaphase (a for apart-chromosomes move apart) Sister chromatids split they are pulled centromere first Start to reach the opposite poles telophase telophase Chromosomes elongate and become chromatin again Nucleus reforms Spindle fibers break down Cytokinesis Cytokinesis happens-division of the cytoplasm and organelles using a cleavage furrow Each new cell begins interphase and starts the cycle all over again. Plant vs Animal Cytokinesis Plants Animal Cell Form a cell plate in the The cell membrane and middle to divide the cell in half The cell plate will eventually become the cell wall. cytoplasm pinch or cleave in the middle until 2 cells are formed DO NOT NEED A CELL PLATE Microscope Lab Look at the data table on page 249. Answer the questions. • 1. Most wbcs are needed for only a short time to fight infection so they don’t have to live for a long time. • 2. Cardiac muscle cells and neurons cannot divide, injuries to the heart and spinal cord cannot heal. The cells of smooth muscles can divide and heal through cell division. • 3. The cells lining the digestive system are more prone to be destroyed. • 4. Cancer cells are long lived and division can occur a seemingly unlimited number of times.