Chapt.10 Mitosis

Chapt.10 Mitosis - Cell Division and Mitosis BIO 2107K:...

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BIO 2107K: BIOLOGICAL PRINCIPLES I Cell Division and Mitosis
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CELL THEORY 1. All organisms are composed of one or more cells. 2. The cell is the smallest unit that has the properties of life. 3. Cells arise only from the growth and division of pre-existing cells.
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>100 Trillion cells (10 14 ) 1 cell
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Cell Division in Prokaryotes BINARY FISSION x Splitting into two parts” x In most prokaryotes, hereditary information is encoded in a single circular DNA molecule known as bacterial chromosome x Binary fission replicates the bacterial chromosome and splits the cell into two
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Fig. 10-17, p. 216
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Cell Division in Eukaryotes x More complex (25,000 genes, not 2500!) x Occurs in a step-wise fashion x Cell Cycle
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Cell Cycle x A period in the life of a cell where cells grow, replicate their DNA, and divide into 2 daughter cells x Divided into interphase and mitosis Interphase Mitosis
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Cell Cycle INTERPHASE MITOSIS
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Cell Cycle INTERPHASE: x Period of cell growth, DNA replication, and preparation for mitosis MITOSIS: x Period that divides the cell into two daughter cells
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P r o p h a s e M t A n T l i ( ) G 1 Period of cell growth before the DNA replicates S Period when DNA Replicates and chromosomal proteins are duplicated I Cytokinesis b g d u c G 0 Cell cycle arrest G 2 Period after DNA replicates; cell prepares for division (Interphase ends in parent cell) Fig. 10-3, p. 203
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Cell Cycle: Interphase Gap 1 (G 1 ) Synthesis (S) Gap 2 (G 2 ) Interphase extends from the end of one mitosis to the beginning of another
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Gap 1 (G 1 ) Gap 0 (G 0 ) Gap 1 of Interphase: Cell makes proteins and other cellular molecules (normal growth and activities) Cell decides whether it needs to divide or not: If yes, on to Synthesis phase! If no, stay in G
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This note was uploaded on 03/06/2012 for the course BIOL 2107 taught by Professor J.louten during the Spring '10 term at SPSU.

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Chapt.10 Mitosis - Cell Division and Mitosis BIO 2107K:...

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