IUB BIOL-L 211 - Cell Cycle (3 pages)

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Cell Cycle

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Cell Cycle


Cell Division Meiosis, Mitosis, Interphase

Lecture number:
Lecture Note
Indiana University, Bloomington
Biol-L 211 - Molecular Biology
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BIOL L 211 Lecture 6 Outline of Last Lecture I DNA Components II DNA Genetic Sequence III Transposons IV Pseudogenes Outline of Current Lecture I Cell Division II Interphase III Mitosis IV Meiosis Current Lecture Cell Cycle I Cell Division A General 1 DNA replicates 2 DNA passed on to daughter cells B Types of Cell Division 1 Binary fission occurs in prokaryotes asexual mechanism still not fully discovered 2 Mitosis occurs in somatic cells aka all non gamete body cells soma means body 3 Meiosis occurs in gametes II Interphase Longest part of cell cycle phase during which cell prepares for mitosis A G1 Cell prepares for chromosome segregation there are checkpoints These notes represent a detailed interpretation of the professor s lecture GradeBuddy is best used as a supplement to your own notes not as a substitute B S phase Replication of DNA occurs 1 Chromosomes de condense which allows replication to proceed 2 Sister chromatid cohesion is established cohesion is what holds the sisterchromatids together 3 Cohesion ring shaped protein complex around copied DNA C G2 Cell prepares for cell division III Mitosis final product 2 new daughter cells A Prophase chromosomes condense nuclear envelope breaks down B Metaphase chromosomes line up along metaphase plate 1 The goal is for bivalent attachment to microtubules from BOTH poles of the cell 2 If this goal is not achieved cancer or other problems may result C Anaphase cohesion digested sister chromatids are pulled to opposite poles 1 Fun fact Proteolysis is a really cool word for the digestion of enzymes D Telophase each chromosome is at a spindle pole the nuclear envelope reforms and DNA de condenses again E Cytokinesis Separation of daughter cells IV Meiosis final product 4 genetically different daughter cells A Meiosis I separation of homologous chromosomes 1 Interphase DNA replication 2 Prophase I chromosomes condense pairs of homologous chromosomes align a Crossing over occurs here 3 Metaphase I Pairs of homologous

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