Objective Cell Cycle Essential Question How does a

Objective: Cell Cycle Essential Question: How does a cell replicate and divide successfully?

Vocabulary to know Cell Cycle—the regular pattern of growth, DNA duplication and cell division that happens in Eukaryotic cells. Interphase—Prepares the cell to divide, the cell spends 90% of time in this part of Cell Cycle. The cell copies its DNA and grows in preparation for Cell Division. The DNA is loosely organized during interphase. Mitosis—The part of the cell cycle where the nucleus of the cell divides—each nucleus with its own identical set of DNA. Happens in all body cells except egg and sperm. There are four stages of Mitosis. Cell spends 10% of its time in Mitosis. Cytokinesis—Divides the cytoplasm into two cells and completes a full stage of the cell cycle. Animal Cells and Plant cells differ in cytokinesis. Animal cells membranes pinch into to—but plant cells must form a plate in between the two cells because of the cell wall.

Interphase Gap 1 (G 1) Cell carries on normal functions for whatever type of cell it is. Cell increases in size and organelles increase in number During G 1 a cell must pass a critical checkpoint before it can proceed most animal cells need adequate nutrition, size and relatively undamaged DNA before it can divide properly.

Interphase: con’t Synthesis (S) Second step of interphase means “the combining of parts to make a whole” During this stage the cell makes a copy of its nuclear DNA By the end of S the Eukaryotic cell has 2 complete sets of DNA

Interphase Con’t Gap 2 (G 2) Third step of Interphase Carries out normal functions and additional cell growth Just like G 1 there is a critical checkpoint—everything must be in order—including size, and relatively undamaged DNA before the cell can go on to Mitosis.

Mitosis!!! Independent work! Complete the Mitosis Flip Book assignment following the directions at the top of the handout. You will need your TEXTBOOK pages 140 and 141 to complete this assignment. Make sure to include detailed notes, complete the diagram of each phase—including color and labels. After completing the flip book portion please answer the analysis questions. These questions must in complete sentences with good supporting details from the text book and your notes. The info comes from sections 5. 1 and 5. 2 in the book. Scientific Vocabulary should be used where appropriate. Please glue flip book onto pg 84 and analysis questions will go onto pg 85 of your ISN

Mitosis—The 4 th step in the cell cycle! Includes 2 processes—Mitosis and Cytokinesis Mitosis is the division of the CELL NUCLEUS and ITS CONTENTS. During Mitosis the nuclear membrane dissolves, already duplicated DNA condenses are proteins and separates, and 2 nuclei are formed. Cytokensis is the process of cytoplasm dividing The end result of Mitosis (including cytokinesis) are TWO GENETICALLY IDENTICAL CELLS