Cell Division – a review. Cell Cycle Control: What happens at each checkpoint? M = mitosis...
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Transcript of Cell Division – a review. Cell Cycle Control: What happens at each checkpoint? M = mitosis...
![Page 1: Cell Division – a review. Cell Cycle Control: What happens at each checkpoint? M = mitosis (nuclear division) C = cytokinesis (cytoplasmic division) G.](https://reader035.fdocuments.in/reader035/viewer/2022062517/56649f275503460f94c3f0af/html5/thumbnails/1.jpg)
Cell Division – a review
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Cell Cycle Control: What happens at each checkpoint?
M = mitosis (nuclear division)C = cytokinesis (cytoplasmic division)G = gap (cell growth)S = synthesis (DNA replicated, cell growth)
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When to Divide?
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Growth Inhibition
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Control Problems - Cancer
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Supercoiling (DNA coils forming a chromatid)
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Human Chromosomes (unreplicated)
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Human Chromosomes (replicated and supercoiled)
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Chromosome (replicated)
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Chromosome
Each DNA molecule coils to form a single chromatid. The two chromatids of a replicated chromosome are genetically identical.
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The Cell Cycle (Overview)
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Mitosis - Stages
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Prophase and Metaphase
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Anaphase and Telophase
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Cytokinesis (animal and plant)
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MEIOSISthe other type of nuclear division
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Gametes…why haploid?
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Oogenesis
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Spermatogenesis
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Meiosis
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Meiosis Overview
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Meiosis (Part I)
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Meiosis (Part II)
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Independent Assortment of Chromosomes
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Independent Assortmentanother view
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What happens when
chromosomes do not separate
properly during meiosis?
Nondisjunction
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Down’s Syndrometrisomy 23
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Crossing Over Leads to Genetic Variability
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Compare Mitosis and Meiosis
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Mitosis vs. Meiosis