BIO 182Bang, Michel (Christofer)2013 SpringWeek 3Lecture 5January 25Cell DivisionFour Events Occur1. Reproductive signal-to initiate cell division2. Replication of DNA3. Segregation-distribution of DNA into TWO new cells4. Cytokinesis-separation of the TWO new cellsEukaryotic cell division :MitosisEukaryotic DNA occurs in 2 statesUncoiled-chromatin; for transcription and protein synthesisCoiled-chromosomes; Condensed for cell divisionGoal of Mitosis- Move identical genetic info from parent into offspring cells before cell division- Separate and package replicated DNA into new cellsDiploid cell entering mitosis- 3 pairs of chromosomes- 2n=6- Goal: 2 daughter cells indentical to parentG1 cell cycle- Protein synthesis (cells require this)- G1 phase=10 hours for skin cellS-Cell Cycle- DNA is copied before cell division- S phase=9 hours (skin cell)DNA Replication- Making TWO identical copies of a chromosomeThese 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.- Before Replication:i) 1 chromosomeii) =1 chromatidiii) = 1 piece of DNA- After Replicationi) 1 chromosomeii) =2 chromatidsiii) 2 pieces of DNAG2 Cell Cycle- Addition proteins made for mitosis- Centrosomes begin to migrate to poles- G2 Phase=4 hours (skin cell)*Know the Cell Cycle*- Interphase- Prophase- Prometaphase- Metaphase- Anaphase- TelophasePCytokinesis-division of cytoplasmSomatic cells-cells of the bodyKaryotype-number, shapes, and sizes of the chromosomes in a cellDiploid-one set of chromosomes from each parent-2 copies of the genomeHaploid-Number of chromosome in a gamete only one copy of genomePloidy-Number of homologous set of chromosome in a
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