Set_3B_Dr._Wilson_MCDB1A.2010

Set_3B_Dr._Wilson_MCDB1A.2010 - Mitosis The process used by...

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Unformatted text preview: Mitosis The process used by eukaryotic cells to separate the chromosomes (genes) when they divide into 2 daughter cells ( except for the special situation of meiosis in development of sperm and eggs ) The two identical chromatids of each chromosome in the parent cell separate from each other; one goes to one of the daughter cells and the second goes to the other daughter cell The DNA of each daughter cells after mitosis is identical to the DNA of the parent cell Prophase important events 1. The cytoskeleton breaks down, the endomembrane system is dispersed 2. The chromatin condenses to the mitotic chromosome form 3. The centrosomes move to opposite sides of the nucleus and become the 2 poles of the mitotic spindle ( spindle poles ) Figure 11.11 The Phases of Mitosis (Part 1) Prometaphase- important events The nuclear envelope breaks down (this is the beginning of prometaphase) A kinetochore forms at the centromere of each chromatid The microtubules attach to the chromosomes which can now move to build the spindle Figure 11.11 The Phases of Mitosis (Part 2) Metaphase important events The chromosomes are aligned at the metaphase plate -the center of the spindle-the mitotic spindle looks static, but the microtubules are highly dynamic Building of the mitotic spindle is completed Metaphase checkpoint- This is is a surveillance checkpoint -the cell is ensuring that the spindle is fully formed and is set to go Figure 11.11 The Phases of Mitosis (Part 2) Anaphase...
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Set_3B_Dr._Wilson_MCDB1A.2010 - Mitosis The process used by...

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