Mitosis Cell Division How do cells divide and

Mitosis: Cell Division

How do cells divide and reproduce?

Cell Division 1. Mitosis: division of nucleus 2. Cytokinesis: division of cytoplasm

Cell division occurs in a series of stages, or phases. • Interphase • Prophase • Metaphase • Anaphase • Telophase • Cytokinesis

Interphase occurs before mitosis begins G 1 S G 2 Interphase

Interphase occurs before mitosis begins Chromosomes are copied (# doubles) • Chromosomes appear as threadlike coils (chromatin) at the start, but each chromosome and its copy (sister chromosome) change to sister chromatids at end of this phase • Nucleus CELL MEMBRANE Cytoplasm

Interphase Animal Cell Plant Cell Photographs from: http: //www. bioweb. uncc. edu/biol 1110/Stages. htm

Prophase 1 st step in Mitosis • • • Mitosis begins (cell begins to divide) Centrioles appear and begin to move to opposite ends (or poles) of the cell. Spindle fibers form between the poles. Sister chromatids Centrioles Spindle fibers

Prophase Animal Cell Plant Cell Spindle fibers Centrioles Photographs from: http: //www. bioweb. uncc. edu/biol 1110/Stages. htm

Metaphase 2 nd step in Mitosis Chromatids (or pairs of chromosomes) attach to the spindle fibers. • Chromatids line up in the middle of the dividing cell. • Centrioles Spindle fibers

Metaphase Animal Cell Plant Cell Photographs from: http: //www. bioweb. uncc. edu/biol 1110/Stages. htm

Anaphase 3 rd step in Mitosis • Chromatids (or pairs of chromosomes) separate and begin to move to opposite ends of the cell. Centrioles Spindle fibers

Anaphase Animal Cell Plant Cell Photographs from: http: //www. bioweb. uncc. edu/biol 1110/Stages. htm

Telophase 4 th step in Mitosis Two new nuclei form. • Chromosomes appear as chromatin (threads rather than rods). • Mitosis ends. • Nuclei Chromatin Nuclei

Telophase Animal Cell Plant Cell Photographs from: http: //www. bioweb. uncc. edu/biol 1110/Stages. htm

Cytokinesis occurs after mitosis • Cell membrane moves inward to create two daughter cells – each with its own nucleus with identical chromosomes.

Animal Mitosis – Review Interphase Metaphase Telophase Prophase Anaphase Interphase

Plant Mitosis – Review Interphase Metaphase Telophase Prophase Anaphase Interphase

REMEMBER! Interphase Prophase Metaphase Anaphase Telophase Cytokinesis IPMATC I Pray More At The Church

MITOSIS Mitosis animation

CYTOKINESIS Animal cells – contractile ring forms around the midpoint and pinches the membrane inwards

CYTOKINESIS Plant cells – cell plate forms in the middle and creates new cell wall

Cell Cycle 23

- Cell Division The Cell Cycle 24 24

Cell Cycle Class Project Assignment: Create a comic strip of the cell cycle. 8 groups: G 1 S Interphase G 2 Prophase Metaphase Anaphase M Telophase Cytokinesis

Cell Cycle Class Project Materials: Paper Markers Glue Yarn (chromosomes) Beads (centromeres) Macaroni (centrioles) Thread (spindle fibers)

Cell Cycle Class Project Make sure you consult with other groups so that cell shape/size is consistent and chromosome colors are the same. Process: 1. Draw the shape of your cell(s) on the paper. 2. Sketch the structures inside your cell(s) – what do the insides look like during this stage? 3. Glue the appropriate materials on top of the sketch to represent the cell structures. 4. Label everything! 5. At the end, we will connect all the stages in order to form a complete comic strip of the cell cycle. «

Observing Mitosis Lab

Observing Mitosis Lab Whitefish embryo Onion root tip

Observing Mitosis Lab Use the photos below as a guide to identifying the stages of mitosis.