The Cell Cycle & Cell Division. NOTES: 1. Write the purpose for each type of cell division. (mitosis...
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Transcript of The Cell Cycle & Cell Division. NOTES: 1. Write the purpose for each type of cell division. (mitosis...
![Page 1: The Cell Cycle & Cell Division. NOTES: 1. Write the purpose for each type of cell division. (mitosis & meiosis) 2. Draw, label and describe each phase.](https://reader035.fdocuments.in/reader035/viewer/2022081603/56649f335503460f94c4f96f/html5/thumbnails/1.jpg)
The Cell Cycle &
Cell Division
![Page 2: The Cell Cycle & Cell Division. NOTES: 1. Write the purpose for each type of cell division. (mitosis & meiosis) 2. Draw, label and describe each phase.](https://reader035.fdocuments.in/reader035/viewer/2022081603/56649f335503460f94c4f96f/html5/thumbnails/2.jpg)
NOTES:1. Write the purpose for each type of cell division. (mitosis & meiosis)2. Draw, label and describe each phase of mitosis & meiosis.
![Page 3: The Cell Cycle & Cell Division. NOTES: 1. Write the purpose for each type of cell division. (mitosis & meiosis) 2. Draw, label and describe each phase.](https://reader035.fdocuments.in/reader035/viewer/2022081603/56649f335503460f94c4f96f/html5/thumbnails/3.jpg)
MITOSIS
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Mitosis
• two daughter cells from a single parent cell.
• Creates new cells for growth & repair
• The daughter cells are identical to parent cell.
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Mitosis can be divided into stages
• Interphase
• Prophase
• Metaphase
• Anaphase
• Telophase & Cytokinesis
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InterphaseThe cell prepares for division
– DNA replicated– Organelles replicated– Cell increases in size
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Interphase
Photographs from: http://www.bioweb.uncc.edu/biol1110/Stages.htm
![Page 8: The Cell Cycle & Cell Division. NOTES: 1. Write the purpose for each type of cell division. (mitosis & meiosis) 2. Draw, label and describe each phase.](https://reader035.fdocuments.in/reader035/viewer/2022081603/56649f335503460f94c4f96f/html5/thumbnails/8.jpg)
ProphaseThe cell prepares for nuclear division
– Packages DNA into chromosomes
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Prophase
Photographs from: http://www.bioweb.uncc.edu/biol1110/Stages.htm
![Page 10: The Cell Cycle & Cell Division. NOTES: 1. Write the purpose for each type of cell division. (mitosis & meiosis) 2. Draw, label and describe each phase.](https://reader035.fdocuments.in/reader035/viewer/2022081603/56649f335503460f94c4f96f/html5/thumbnails/10.jpg)
MetaphaseThe cell prepares chromosomes for
division
– Chromosomes line up at the center of the cell
– Spindle fibers attach from daughter cells to chromosomes at the centromere
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Metaphase
Photographs from: http://www.bioweb.uncc.edu/biol1110/Stages.htm
![Page 12: The Cell Cycle & Cell Division. NOTES: 1. Write the purpose for each type of cell division. (mitosis & meiosis) 2. Draw, label and describe each phase.](https://reader035.fdocuments.in/reader035/viewer/2022081603/56649f335503460f94c4f96f/html5/thumbnails/12.jpg)
AnaphaseThe chromosomes divide
– Spindle fibers pull chromosomes apart
– ½ of each chromosome (called chromotid) moves to each daughter cell
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Anaphase
Photographs from: http://www.bioweb.uncc.edu/biol1110/Stages.htm
![Page 14: The Cell Cycle & Cell Division. NOTES: 1. Write the purpose for each type of cell division. (mitosis & meiosis) 2. Draw, label and describe each phase.](https://reader035.fdocuments.in/reader035/viewer/2022081603/56649f335503460f94c4f96f/html5/thumbnails/14.jpg)
TelophaseThe cytoplasm divides
– DNA spreads out– 2 nuclei form– Cell wall pinches in to
form the 2 new daughter cells
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Telophase
Photographs from: http://www.bioweb.uncc.edu/biol1110/Stages.htm
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Mitosis -- Review
Interphase
Prophase
Metaphase
Anaphase
Telophase
Interphase
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MEIOSIS
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Meiosis
• Creates new cells for reproduction
• One parent cell produces four daughter cells.
• Daughter cells have half the number of chromosomes found in the original parent cell
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Meiosis
During meiosis, DNA replicates once, but the nucleus divides twice.
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Meiosis
Four stages can be described for each division of the nucleus.
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Meiosis I
First division of meiosis
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First Division of Meiosis• Prophase 1: Each chromosome duplicates and
remains closely associated. These are called sister chromatids.
• Metaphase 1: Chromosomes align at the center of the cell.
• Anaphase 1: Chromosome pairs separate with sister chromatids remaining together.
• Telophase 1: Two daughter cells are formed with each daughter containing only one chromosome of the chromosome pair.
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Prophase I
http://everyschool.org/u/logan/cellreproductionx/rogersa/research/meiosis.html
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Meiosis
Second Division of Meiosis
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Second Division of Meiosis
• Prophase 2: DNA does not replicate.
• Metaphase 2: Chromosomes line up at the center of the cell
• Anaphase 2: Centromeres divide and sister chromatids move separately to each pole.
• Telophase 2: Cell division is complete.
Four haploid daughter cells are formed.
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Prophase II
http://everyschool.org/u/logan/cellreproductionx/rogersa/research/meiosis.html
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Meiosis
http://www.biosci.uga.edu/almanac/bio_103/notes/apr_3.html.
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Meiosis Animation
http://www.rothamsted.bbsrc.ac.uk/notebook/courses/guide/movie/meiosis.htm
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Differences in Mitosis & Meiosis
• Mitosis– Asexual– Cell divides once– Two daughter cells– Genetic information is
identical
• Meiosis– Sexual– Cell divides twice– Four haploid daughter
cells– Genetic information is
different
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Comparison Animations
http://www.pbs.org/wgbh/nova/baby/divi_flash.html