Stages of Mitosis Eukaryotic Cell Division. Cell Division Facts All living organisms start out from a single cell The average Human has about 10 trillion.

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Presentation transcript:

Stages of Mitosis Eukaryotic Cell Division

Cell Division Facts All living organisms start out from a single cell The average Human has about 10 trillion cells!

Chromosomes During interpahse, genetic material exists as chromatin (DNA coiled around histones) To prevent from getting tangled during division DNA coils further into Chromosomes.

Chromosome = 2 Chromatids Sister chromatids are copies of the exact same chromosome (same DNA sequence) chromatid =1/2 of a replicated chromosome Held together by a centromere

Interphase: Between Divisions, Cell is preparing to divide G 1 phase = growth phase, cell gets bigger S phase = synthesis phase, DNA replicates G 2 phase = Organelles multiply

Mitosis

PROPHASE Chromatin coils into chromosomes Nuclear envelope breaks down Spindle fibers and centrioles from Centrioles move to opposite ends of cell

METAPHASE Chromosomes are moved to the center of the cell by the spindle fibers Centrioles act as anchors for the spinal fibers

ANAPHASE Centromeres split apart Sister chromatids are pulled apart by spinal fibers Each chromatid is now a separate chromosome

Telophase / Cytokinesis Cytokinesis is the division of the chromosomes and organelles between the 2 daughter cells Cytoplasm is divided into 2 daughter cells Each daughter cell has its own set of chromosomes Nuclear envelope reforms In plants a cell plate forms between 2 daughter cells Chromosomes uncoil into chromatin Note daughter cells are smaller than surrounding cells

Websites to visit with Mitosis animations cell_cycle/cells3.htmlhttp:// cell_cycle/cells3.html ns/mitosis.htmlhttp:// ns/mitosis.html ations/mitosis.htmlhttp:// ations/mitosis.html