mitosis. mitosis and the cell cycle sexual reproduction – combining genetic info from 2 organisms...
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MITOSIS
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Mitosis and the Cell Cycle
Sexual reproduction – combining genetic info from 2 organisms of the same species to create offspring
Asexual reproduction – offspring arises from single parent.
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How do little elephants grow up to be BIG elephants?
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Why do animals shed their skin?
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Three reasons why cells reproduce by asexual reproduction:
1. Growth 2. Repair 3. Replacement
Skin cancer - the abnormal growth of skin cells - most often develops on skin exposed to the sun.
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The Cell CycleThe sequence of growth and
division of a cell.95% of cell cycle
in interphase5% of cell cycle
in mitosis
Interphase, mitosis, cytokinesis
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Interphase
Growth Stage 1 (G1) – metabolic activity of the cell
Synthesis Stage (S) – metabolic activity of the cell, replication of DNA
Growth Stage 2 (G2) – metabolic activity of the cell, prepare for division
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Interphase Normal cell life functions
Animal Cell Plant Cell
Photographs from: http://www.bioweb.uncc.edu/biol1110/Stages.htm
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MITOSIS is the process of the nucleus of the cell duplicating and dividing
There are
four phases
of mitosis.
PROPHASE METAPHASE ANAPHASE TELOPHASE
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Prophase (DNA has already copied itself) Nuclear membrane fades Chromosomes condense – can see
sister chromatids
and centromere Spindle forms Centrioles start to move
to opposite poles
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Prophase
Animal Cell Plant Cell
Photographs from: http://www.bioweb.uncc.edu/biol1110/Stages.htm
Spindle fibers
Centrioles
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Metaphase
Chromosomes line up along the equator (middle) of the cell
Each chromatid is attached to spindle with centromere
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Metaphase
Animal Cell Plant Cell
Photographs from: http://www.bioweb.uncc.edu/biol1110/Stages.htm
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Anaphase
Centromeres divideSister chromatids are pulled
apart to opposite poles of the cell
Each chromatid is now a separate chromosome
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Anaphase
Animal Cell Plant Cell
Photographs from: http://www.bioweb.uncc.edu/biol1110/Stages.htm
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Telophase
Spindle fibers dissolveChromosomes reach the
opposite poles and begin to uncoil (lengthen)
Nuclear envelopes (2) reform
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Telophase
Animal Cell Plant Cell
Photographs from: http://www.bioweb.uncc.edu/biol1110/Stages.htm
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Cytokinesis
Cytoplasm dividesTwo new daughter cells are
now separate
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Animal Mitosis -- Review
Interphase
Prophase
Metaphase
Anaphase
Telophase
Interphase
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Plant Mitosis -- Review
Interphase
Prophase
Metaphase
Anaphase
Telophase
Interphase
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https://www.youtube.com/watch?v=L0k-enzoeOM
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