m9uu1I-Lecture 23 Cell cycle and Mitosis

m9uu1I-Lecture 23 Cell cycle and Mitosis - Biol141...

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Biol141 Foundations in Modern Biology Cellular Biology and Genetics Lecture 22 – Friday, October 21 th , 2011 Mitosis. Reading: Freeman, Emory 2 nd Ed. Chapter 11.1 – 11.2.
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Learning objectives At the end of this lecture, you will be able to: 1) Compare the functions of mitosis and meiosis. 2) Explain the changes in chromosome structure and number throughout the cell cycle. 3) Describe the 4 stages of the cell cycle. 4) Explain the stages of mitosis.
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1. What is the purpose of cell reproduction? “Where a cell exists, there must have been a cell, just as the animal arises only from an animal and the plant only from a plant.” - Rudolf Virchow, 1855 Since all living cells are mortal, cell reproduction or replacement is universal among living organisms.
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There are two types of cell division : meiosis and mitosis. Meiosis leads to the production of gametes (eggs and sperm). -Genetic material is copied and then divided equally. -Daughter cells are genetically identical to the parent cell. -Daughter cells have half the amount of genetic material as the parent cell. Mitosis leads to the production of all other cell types, referred to as somatic cells .
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There are two types of cell division : meiosis and mitosis. Meiosis leads to the production of gametes (eggs and sperm). -Daughter cells have half the amount of genetic material as the parent cell. Mitosis leads to the production of all other cell types, referred to as somatic cells . Mitosis and cytokinesis are responsible for three key events in multicellular eukaryotes: 1. Growth 2. Wound repair 3. Asexual reproduction
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2. A eukaryotic chromosome contains a single double helix of DNA wrapped around proteins. DNA encodes the cells genetic information. A gene is a section of DNA that encodes a specific protein or RNA.
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Chromosome structure changes before and during Mitosis Chromosomes can be stained with dyes and observed
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m9uu1I-Lecture 23 Cell cycle and Mitosis - Biol141...

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