http www brainpop comhealthbodysystemscells Mitosis Cell division http

http: //www. brainpop. com/health/bodysystems/cells/ Mitosis Cell division http: //www. brainpop. com/science/cellularlifeandgenetics/cellstructures/

Cell division All complex organisms originated from a single fertilized egg. Every cell in your body started here, through cell division the numbers are increased Cell then specialize and change into their various roles

Mitosis l Mitosis is the process by which new body cell are produced for: ¡Growth ¡Replacing damaged or old cells. Cell division occurs in a series of stages, or mitosis.

Parent cell Chromosomes are copied and double in number Chromosomes now split 2 daughter cells identical to original

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

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 (or poles) appear and begin to move to opposite end 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. 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 Prophase Metaphase Anaphase Telophase Interphase

Plant Mitosis -- Review Interphase Prophase Metaphase Anaphase Telophase Interphase

Cell Cycle 20

- Cell Division The Cell Cycle 21 21

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

Mitosis l All daughter cells contain the same genetic information from the original parent cell from which it was copied. l Every different type cell in your body contains the same genes, but only some act to make the cells specialize – e. g. into nerve or muscle tissue.

Mitosis – bone cell slides 1 2 Chromosomes copied Parent cell 3 Copies separating Cells split 4 5 2 daughter cells

Plants

Rat – epithelial cells http: //www. brainpop. com/science/cellularlifeandgenetics/mitosis/