Dr._Wilson_Set_6_1A.09

Dr._Wilson_Set_6_1A.09 - Mitosis Occurs when eukaryote...

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Mitosis Occurs when eukaryote cells divide into 2 cells, except for the special situation of meiosis in development of sperm and eggs the process by which the two identical chromatids of each chromosome in the parent cell separate from each other, with one chromatid going to one of the daughter cells and the second chromatid going to the other daughter cell The DNA of both daughter cells is identical to the DNA of the parent cell
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Mitosis- How the two chromatids of each chromosome of a parent cell get distributed to the two daughter cells
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Mitosis Divided into five phases: 1) Prophase 2) Prometaphase 3) Metaphase 4) Anaphase 5) Telophase
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Prophase Important events 1. The cytoskeleton breaks down, the endomembrane system is dispersed, and in animal cells, the cells become round 2. Inside the nucleus, the chromosomes condense to the mitotic chromosome form 3. The duplicated centrosomes (duplication occurred during interphase) move to opposite sides of the nucleus and become the 2 poles of the mitotic spindle
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Early prophase in an animal cell
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A plant cell in prophase Condensing chromosomes
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Prometaphase The nuclear envelope breaks down (this signals the beginning of prometaphase)
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Prometaphase The nuclear envelope breaks down (this signals the beginning of prometaphase) Kinetochores form at the centromeres of the chromatids (this is the place where the microtubules attach)
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Kinetochores form
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A kinetochore A kinetochore with attached kinetochore microtubules
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Pro-Metaphase Microtubules growing from the poles find and attach to the kinetochores The chromosomes begin to move (by the microtubules) toward a central plane between the two spindle poles
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Prometaphase -plant cell
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Very late prometaphase- animal cell
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Metaphase The chromosomes are completely aligned at the “metaphase plate” -the center of the spindle The mitotic spindle is fully formed
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