1500 Lecture 8W Mitosis Meiosis

1500 Lecture 8W Mitosis Meiosis - Cell Division Mitosis...

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ENVS 1500 Prof. L. Molot Feb 29, 2016 Cell Division: Mitosis & Meiosis
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Reproduction Parents produce a new generation of cells or multicelled individuals under instructions “Daughter cells” must have hereditary instructions, encoded in DNA enough metabolic machinery to start up their own operation What mechanisms are used to parcel out this material to daughter cells?
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Division Mechanisms Eukaryotic organisms have two types of cell division which divide DNA and cell machinery into 2 daughter cells: Mitosis which produces daughter cells with full number of chromosomes Meiosis: specialized division which produces gametes (e.g. sperm and egg cells) with ½ of the parental DNA
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Mitosis Occurs in eukaryotic cells Type of cell division which divides cell machinery and duplicates DNA so that both daughter cells are exact copies of the parent cell Roles: - to produce more cells when a multicellular organism is growing (increase in body size) - new limbs (amphibians) - cell replacement
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Chromosomes In eukaryotes, DNA is organized into chromosomes inside the nucleus Chromosomes consist mostly of DNA and special proteins called histones
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