CELL CYCLE. Critical Question 1 CELL CYCLE Critical Question 1. Rank the amount of time a cell spends in each stage of the cell cycle from greatest to least amount of time (using the stage full titles). PAGE 42 2. Grab a Red, Blue, Green (colored pencil, marker, highlighter, etc.) 3. Discuss with your table. How do you grow from a baby to an adult?

7 Characteristics of Life Composed of cells Reproduction Require Energy Growth & Develop Homeostasis Environmental Response Adapt & Change (Evolve)

KEY CONCEPT – write in your spiral Cells have separate phases of growth, reproduction, and normal functions.

Cell Cycle for Unicellular & Multicellular amoeba One-celled organisms for asexual reproduction Multi-celled organisms for growth & development for repair & replacement starfish Unicellular organisms Cell division = reproduction Reproduces entire organism& increase population Multicellular organisms Cell division provides for growth & development in a multicellular organism that begins as a fertilized egg Also use cell division to repair & renew cells that die from normal wear & tear or accidents

Cells constantly divide to replace old cells Cell Lifespans: Stomach human 2 to 9 days

Cell Cycle or Cell Division At this moment, millions cells in your body are dividing! This is known as the cell cycle!!

Cell Cycle Three Stages: 1. Interphase 2. Mitosis & 3. Cytokinesis

3 Stages Interphase: Phase that prepares cell for division Gap 1 1. G1 Phase Cell growth 2. S Phase DNA Replicates Synthesis 3. G2 Phase Gap 2 Cell Growth

Main Stages of Cell Cycle are Gap 1, Synthesis, Gap 2, and Mitosis then Cytokinesis. Gap 1 (G1): majority of cell growth, organelles replicate and normal functions DNA synthesis (S): DNA copied (doubled) Gap 2 (G2): additional growth Mitosis (M): includes division of the cell, it’s organelles, and cytoplasm (cytokinesis) creating 2 NEW CELLS Mitosis occurs only if the cell is large enough and the DNA undamaged.

Signal initiates Cell Cycle!! G1Phase: Growth nucleus

S Phase: DNA Replication nucleus cell DNA in chromosomes

G2Phase: Growth cell nucleus

STAGE 2: MITOSIS . STAGE 3: CYTOKINESIS *Mitosis is divided into four phases: PROPHASE, METAPHASE, ANAPHASE & TELOPHASE. Final stage in which cytoplasm divides and organelles are distributed into each new cell. (Usually begins during TELOPHASE of mitosis)

Cytokinesis in Animal & Plant Cell Animal Cells vs. Cell membrane squeezes Plant Cells Cell plate forms across middle of cell

Unicellular Organisms = Binary Fission Binary fission occurs in prokaryotes. Binary fission produces two daughter cells genetically identical to the parent cell. parent cell DNA duplicates cell begins to divide daughter cells

CELL CYCLE. Critical Question 1 CELL CYCLE Critical Question 1. Rank the amount of time a cell spends in each stage of the cell cycle from greatest to least amount of time (using the stage full titles).

CELL CYCLE Worksheet

Mitosis (2nd Stage of Cell Cycle) Get out spiral, Page 44 Title Notes: Mitosis (Stage 2 of Cell Cycle) Write Critical Questions Why is it important for cells to undergo Mitosis? Turn to page 41 Work the cell cycle worksheet To create two new identical cells from a parents cell that helps an organism reproduce, grow or develop, and repair themselves.

Mitosis (2nd Stage of Cell Cycle)

Mitosis also occurs in a series of steps!

Stages of Cell Cycle: I. P.M.A.T.C. Stages of Mitosis: P.M.A.T.C.

Please Make Another Two Cells I.P.M.A.T.C. Overview of mitosis prophase interphase Please Make Another Two Cells cytokinesis metaphase anaphase telophase

Answer the Critical Question