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mitosis

Chapter 12 Cell Cycle

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Lecture Outline for Campbell/Reece Biology, 7th Edition, ? Pearson Education, Inc. 12-1 Chapter 12 The Cell Cycle Lecture Outline Overview: The Key Roles of Cell Division ? The ability of organisms to reproduce their kind is the one characteristic that best distinguishes living things from nonliving matter. ? The continuity of life is based on the reproduction of cells, or cell division. Cell division functions in reproduction, growth, and repair. ? The division of a unicellular organism reproduces an entire organism, increasing the population. ? Cell division on a larger scale can produce progeny for some multicellular organisms. ? This includes organisms that can grow by cuttings.

Mitosis and Meiosis

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2/27/13 1:16 PM Sisterchromatids ? 2 identical copies of a chromosome/chromatin attached at a centromere. Meiosis 2 divisions called meiosis I and meiosis II. During Meiosis I Crossing over ? exchanges genetic information between homologous chromosomes. Independent assortment ? Line up randomly and separate into daughter cells Both increase genetic diversity in sexual reproduction. During Meiosis II Sisterchromatids divide Final Result 4 cells, haploid genetically different from original cell. Mitosis and Meiosis 2/27/13 1:16 PM 2/27/13 1:16 PM
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Chapter 12 Notes

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mitosis

Biology 240 SI Session #10 Chapter 12 SI Leader: Lauren Curtis Email: [email protected] Prokaryotes: Describe the process of 'binary fission' : Binary fission is the process by which a prokaryotic cell cell reproduces asexually by dividing in half. This does not include mitosis in prokaryotes, but a process all in it's own. The cell duplicates it's DNA, doubling in size, and then splits into two daughter cells. Here are some terms you need to be familiar with in regards to cell division... Chromatin: A DNA-protein complex, represents DNA in it's unfolded and non condensed form. Chromosomes: Represents DNA folded and condensed down as the cell gets ready to divide. It organizes the DNA in a way where parts won't get lost when the cell splits in half.

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