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The Cell Cycle Mitosis Asexual Reproduction 1 1 1 We shed 1.5 million skin cells every hour with a new skin surface every 28 days. The process of asexual reproduction begins after a sperm fertilizes an egg. http://www.the-simple-homeschool.com/cell-cycle-mitosis.html 4 Skin cancer - the abnormal growth of skin cells - most often develops on skin exposed to the sun. Cells that reproduce by asexual reproduction reproduce constantly. Mitosis Cycle http://www.cellsalive.com/mitosis.htm Mitosis Interphase • Prophase • Metaphase • Anaphase • Telophase Cytokinesis 5 Chromosomes are copied (# doubles) • Chromosomes appear as threadlike coils (chromatin) at the start, but each chromosome and its copy(sister chromosome) change to sister chromatids at end of this phase • CELL MEMBRANE Nucleus Cytoplasm Animal Cell Plant Cell Photographs from: http://www.bioweb.uncc.edu/biol1110/Stages.htm 6 • • • Mitosis begins Centrioles (or poles) appear and begin to move to opposite end of the cell. Spindle fibers form between the poles. Sister chromatids Centrioles Spindle fibers 7 Animal Cell Plant Cell Spindle fibers Centrioles Photographs from: http://www.bioweb.uncc.edu/biol1110/Stages.htm • Chromatids (or pairs of chromosomes) attach to the spindle fibers at the centromere, and line up at the center of the cell. Centrioles Spindle fibers 8 Animal Cell Plant Cell Photographs from: http://www.bioweb.uncc.edu/biol1110/Stages.htm • Chromatids (or pairs of chromosomes) separate and begin to move to opposite ends of the cell as the cell stretches. Centrioles Spindle fibers 9 Animal Cell Plant Cell Photographs from: http://www.bioweb.uncc.edu/biol1110/Stages.htm • • • Two new nuclear envelopes form. Chromosomes appear as chromatin (threads rather than rods). Mitosis ends. Nuclei Nuclei Chromatin 10 Animal Cell Plant Cell Photographs from: http://www.bioweb.uncc.edu/biol1110/Stages.htm • In animal cells, the membrane pinches inward to create two daughter cells – each with its own nucleus with identical chromosomes. • In plant cells, a new section of cell wall forms between the two new nuclei forming two new daughter cells. 11 Animated Mitosis Cycle http://www.youtube.com/watch?v=cvlpmmvB_m4&feature=youtube_gdata_player Mitosis Interphase • Prophase • Metaphase • Anaphase • Telophase Cytokinesis Animal Mitosis -- Review Interphase Prophase Metaphase Anaphase Telophase Interphase 12 Plant Mitosis -- Review Interphase Prophase Metaphase Anaphase Telophase Interphase 26 13 Interphase Prophase Metaphase Anaphase Telophase Cytokinesis IPMATC I Pray More At The Church I P M A T C IPMATC 14 http://www.cellsalive.com/mitosis.htm Mitosis Bead Activity http://www.youtube.com/watch?v=zGVBAHAsjJM &feature=youtube_gdata_player 15
