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Cell Cycle - Cell Cycle A Function 1 Unicellular organisms...

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Cell Cycle A. Function 1. Unicellular organisms- increase number Ex) bacteria a. asexual reproduction 2. Multicellular organisms- growth, replacement of cells Ex) humans start as zygote B. Eukaryotes - because we are so complex we need cell cycle: 46 chromosomes, membrane bound organelles and cytoskeleton - Cell Cycle is made up of three parts: Interphase, Mitosis (Karyokinesis), and Cytokenesis 1. Interphase (chromatin, nucleus, nucleolus) a. G1- increase cell size, ribosomes, mitochondria, etc… - all organelles and cytoplasm doubles - 46 chromosomes in form of chromatin b. S phase- DNA duplicated, chromosomes- consist of sister chromatids Chromosome Centromere Chromatid Sister Chromatids c. G2- spindle fibers assemble
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- 46 chromosomes - 92 chromatids 2. Mitosis- nuclear division (equational)
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a. Prophase - chromatin condenses, centrioles form, nucleoli and nuclear membrane disappear, 46 chromosomes, 92 chromatids b. Metaphase - chromosomes line up at equatorial plate. 46 chromosomes, 92 chromatids c. Telophase
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