Lecture 22 Mitosis Slides

Lecture 22 Mitosis Slides - Dr. Brown LSB 416 x 2-8563...

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Dr. Brown LSB 416 x 2-8563 deborah.brown @sunysb.edu Office hours: Wed. and Thurs 12-1 PM Today’s lecture: Reproduction of cells; MITOSIS (Chap. 12) 8 th Ed. pp. 228-237 7 th Ed. pp. 218-227
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All cells in any organism are genetically identical (have the same DNA)
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When ANY cell reproduces (divides): Each “daughter cell” gets the same amount of DNA
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First step in division of ANY cell: Duplication of chromosome(s)
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A chromosome: contains ONE molecule of DNA
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Prokaryotes (organism is one cell): have 1 chromosome (1 DNA molecule)
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NO MITOSIS IN PROKARYOTES!!!
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Chromosome replicates and attaches to the membrane Bacterial Cell Division
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Attachment sites separate as cell grows Bacterial Cell Division
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Cell divides; each new cell has one chromosome! Bacterial Cell Division
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Eukaryotic cells: cell cycle Cells divide ONLY at a specified time.
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4 Phases of Cell Cycle : G1 S G2 M = mitotic phase } interphase S phase = DNA synthesis
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Mitotic phase : When cells divide Interphase : When cells are NOT dividing
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Mitotic phase: 1) Mitosis : separation of duplicated chromosomes 2) Cytokinesis ; cell division
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Lecture 22 Mitosis Slides - Dr. Brown LSB 416 x 2-8563...

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