Chapter 12 Notes - Chapter 12 The Cell Cycle Overview The...

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Chapter 12 The Cell Cycle Overview: The Key Roles of Cell Division The continuity of life Is based upon the reproduction of cells, or cell division Unicellular organisms Reproduce by cell division Multicellular organisms depend on cell division for Development from a fertilized cell Growth Repair The cell division process Is an integral part of the cell cycle Concept 12.1: Cell division results in genetically identical daughter cells Cells duplicate their genetic material Before they divide, ensuring that each daughter cell receives an exact copy of the genetic material, DNA Cellular Organization of the Genetic Material A cell’s endowment of DNA, its genetic information Is called its genome The DNA molecules in a cell Are packaged into chromosomes Eukaryotic chromosomes Consist of chromatin, a complex of DNA and protein that condenses during cell division In animals Somatic cells have two sets of chromosomes Gametes have one set of chromosomes Distribution of Chromosomes During Cell Division In preparation for cell division DNA is replicated and the chromosomes condense
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Each duplicated chromosome Has two sister chromatids, which separate during cell division
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