Chapter12 - Chapter 12 The Cell Cycle I. Cell Division is...

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Chapter 12 The Cell Cycle I. Cell Division is ESSENTIAL for survival a. II. Background a. Cell division = distribution of IDENTICAL sets of chromosomes to DAUGHTER CELLS b. The “identical sets of chromosomes” = the cells GENOME c. Chromosomes = condensed, tightly coiled, DNA/protein complexes that are easily stained for microscopy d. Every eukaryotic species has UNIQUE # OF CHROMOSOMES i. Humans have 46 chromosomes in the SOMATIC CELLS & 23 chromosomes in the GAMETIC CELLS III. A chromosome a. Each chromosome contains a single linear piece of DNA b. Each piece of DNA has proteins associated with it i. The complex of DNA + PROTEIN = Chromatin ii. When chromatin condenses, after replication (i.e., duplication of the DNA), it is then called a CHROMSOME IV. Chromosomes after duplication (i.e., replication) a. Each DUPLICATED chromosome has a “sister” i. Called SISTER CHROMATIDS ii. Chromatids are attached, by proteins, at the CENTROMERE SEE FIGURE 12.3 V. MITOSIS a. Defined: “division of the nucleus”
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Chapter12 - Chapter 12 The Cell Cycle I. Cell Division is...

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