01_The Cell Cycle and Sexual Life Cycles

01_The Cell Cycle and Sexual Life Cycles - THE CELL CYCLE...

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THE CELL CYCLE AND SEXUAL LIFE CYCLES Reading: Chapter 12, pp. 228-238; Chapter 13 A. THE CELL CYCLE 1. The cell cycle is a controlled sequence of events that comprises cell growth and division. 2. Cells that progress through the cell cycle ± growing unicellular organisms ± embryonic cells in young animals ± stem cells in mature animals ± cells in the meristems (growing points) of plants ± cells at the growing points of algae and fungi ± cells that divide to repair an injury in animals and plants Fig. 12.5 What activity does the cell engage in during the G 1 part of interphase?
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The Cell Cycle and Sexual Life Cycles - 2 3. Cells that do not normally progress through the cell cycle differentiated cells performing specialized functions dormant or resting stages of unicellular or multicellular organisms 4. The cell cycle is subject to complex control a) Cell growth, division of the cell's contents, and division of the cell's genetic information must all be coordinated. B. MITOSIS 1. Mitosis is a division of the nucleus that involves an equational division of the chromosomes. After mitosis is finished, each daughter nucleus is genetically identical to 2. Before mitosis, the chromosomes must be duplicated.
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The Cell Cycle and Sexual Life Cycles - 3 a) Each chromosome is duplicated to give two identical sister chromatids . b) As a result of chromosome duplication, each allele (variant form of a gene) is copied. Fig. 12.4 Can light microscopy resolve individual chromosomes at all stages of the cell cycle?
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The Cell Cycle and Sexual Life Cycles - 4 3. Stages of mitosis a) prophase b) prometaphase Fig. 12.6 How many chromosomes are shown in the diagram of prometaphase? How many chromatids?
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c) metaphase d) anaphase e) telophase 4. Mitosis is usually (but not always) followed by cytokinesis . C. MEIOSIS
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01_The Cell Cycle and Sexual Life Cycles - THE CELL CYCLE...

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