Cell Division The differences between plant and animal cells 1

Interphase occurs before mitosis begins Chromosomes are copied (# doubles) All organelles and cytoplasm double Chromosomes appear as long thin threadlike coils (chromatin) Cell Membrane Nucleus Cytoplasm

Interphase Plant Cell Animal Cell Photographs from: http://www.bioweb.uncc.edu/biol1110/Stages.htm

Prophase 1st step in Mitosis Centrioles (or poles) appear Spindle fibers form near centrioles. Centromeres appear, hold chromosomes together Nuclear membrane begins to disappear Centrioles Chromosomes Centromere Spindle fibers

Prophase Plant Cell Animal Cell Spindle fibers Photographs from: http://www.bioweb.uncc.edu/biol1110/Stages.htm

Metaphase 2nd step in Mitosis Chromosomes attach to the spindle fibers. Chromosomes line up in center of cell Chromosomes Centromere Centrioles Spindle fibers

Metaphase Plant Cell Animal Cell Photographs from: http://www.bioweb.uncc.edu/biol1110/Stages.htm

Anaphase 3rd step in Mitosis Centrioles tug on spindle fibers Chromosomes separate and begin to move to opposite ends of the cell. Centromeres disappear Centrioles Spindle fibers

Anaphase Plant Cell Animal Cell Photographs from: http://www.bioweb.uncc.edu/biol1110/Stages.htm

Telophase 4th step in Mitosis Two new nuclei form. Spindle fibers and centrioles disappear. Mitosis ends. Nuclear membrane Nuclear membrane Chromosomes Chromosomes

Cytokinesis occurs after mitosis Cytoplasm Divides Animal Cell - Cell membrane moves inward Plant Cell – Cell plate moves outward Animal Plant

Telophase Plant Cell Animal Cell Photographs from: http://www.bioweb.uncc.edu/biol1110/Stages.htm

Animal Cell Division- Review Interphase                                                              Prophase                                                              Metaphase                                                              Anaphase                                                              Telophase                                                              Cytokinesis                                                             

Plant Cell Division- Review Interphase                                                              Prophase                                                              Metaphase                                                              Anaphase                                                              Telophase                                                              Cytokinesis                                                             

Growth- needed so organisms can Repair- injured tissues Three reasons why cells reproduce asexually: Growth- needed so organisms can develop Repair- injured tissues Replace – worn out cells

What type of cells never leave interphase? Muscle Nerve

Skin cancer - the abnormal growth of skin cells - most often develops on skin exposed to the sun. How does it develop?? Cells that reproduce by asexual reproduction reproduce constantly.

IPMATCD REMEMBER! I Payed Money At The Car Dealership Interphase Prophase Metaphase Anaphase Telophase Cytokinesis Daughter Cells IPMATCD A mnemonic to help remember the stages of mitosis. I Payed Money At The Car Dealership

Cell Cycle

- Cell Division The Cell Cycle 20

Mitosis Animation http://www.cellsalive.com/mitosis.htm

How do little elephants grow up to be BIG elephants?

Why do animals shed their skin?

The process of asexual reproduction begins after a sperm fertilizes an egg.

Animated Mitosis Cycle http://www.cellsalive.com/mitosis.htm Interphase Prophase Metaphase Anaphase Telophase Cytokinesis