1 cell cycle.pdf

CELL CYCLE  Section 1: The cell Cycle  Objectives: 1. Describe the stages of the cell cycle.  Cell Cycle: it’s the regular pattern of growth, DNA duplication, and cell division that occurs in eukaryotic cells.  Cell cycle shows four main stages: 1. Gap 1 2....

CELL CYCLE  Section 1: The cell Cycle  Objectives: 1. Describe the stages of the cell cycle.  Cell Cycle: it’s the regular pattern of growth, DNA duplication, and cell division that occurs in eukaryotic cells.  Cell cycle shows four main stages: 1. Gap 1 2. Synthesis Interphase 3. Gap2 4. Mitosis Jigsaw Each group needs 4 points about their cell cycle stage written clearly on a piece of paper  Gap 1 (G1) stage = cell is growing 1. Cell carries out its normal functions. 2. Cell increase in size. 3. Organelles inside the cell increase in number. 4. The cell spends most of its time in the G1 stage. 5. The cell must pass a critical checkpoints before it can proceed to the next stage (Everything must be in order, appropriate cell size, and undamaged DNA).  Synthesis (s) stage: = DNA synthesis  Synthesis means “the combining of parts to make a whole” 1. The cell makes a copy of its nuclear DNA. 2. By the end of this stage, the cell nucleus contains two complete sets of DNA.  Gap 2 (G2) stage = more growing 1. Cells continue to carry out their normal functions. 2. Additional growth occurs. 3. Like G1, this stage includes a critical checkpoint. Mitosis and cytokinesis = division