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Published on : Jun 04, 2015
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Slide 1 -

Mitosis & Meiosis Mitosis animation: http://www.youtube.com/watch?v=2WwIKdyBN_s&feature=related

Slide 2 -

Mitosis: If a cell wants to make a duplicate of itself, it first must copy its DNA (part of a chromosome). The copies then must be separated & sorted into two sides of the cell. The cell then splits in two. Part of each parent is carried to the two new cells. Results in cells such as internal organs, skin, bones, blood, etc.

Slide 3 -

Meiosis: As in mitosis, if a cell wants to make a duplicate of itself, it first must copy its DNA (part of a chromosome). Results in reproductive cells (sperm, eggs, etc). Part of each parent is carried to the four new cells. Meiosis has evolved to solve a problem. The problem is this: some organisms have sex with other organisms – that is, they combine their genes together (creating genetic diversity). Why would this be a problem?

Slide 4 -

This may you remember these terms: MITosis takes the cell and Makes It Two (diploid) Meiosis has to do with sex From the cell’s point of view: mITosis results in Identical Twins mEioSis results in Egg and Sperm (haploid) Clyde Freeman Herreid – Dept. of Biological Sciences: Buffalo State Univ. of New York

Slide 5 -

Mitosis: Meiosis: Each resulting cell still has chromosomes from mom & dad

Slide 6 -

Mitosis Mitosis animations: http://www.youtube.com/watch?v=2WwIKdyBN_s&feature=related http://www.youtube.com/watch?v=VlN7K1-9QB0

Slide 7 -

Vocabulary Diploid Haploid Interphase Prophase Metaphase Anaphase Telophase Cytokinesis

Slide 8 -

Interphase occurs just before Mitosis begins: DNA is replicated along with organelles and other cellular components and the cell prepares for division. http://www.bioweb.uncc.edu/1110Lab/notes/notes1/lab6.htm

Slide 9 -

Mitosis Interphase Animal cell Plant cell Photographs from: http://www.bioweb.uncc.edu/biol1110/Stages.htm

Slide 10 -

1st step in Mitosis: Prophase (preparation phase) http://www.bioweb.uncc.edu/1110Lab/notes/notes1/lab6.htm The DNA recoils, and the chromosomes condense; the nuclear membrane disappears, and the mitotic spindles begin to form.

Slide 11 -

Mitosis Prophase Photographs from: http://www.bioweb.uncc.edu/biol1110/Stages.htm Animal cell Plant cell

Slide 12 -

2nd step in Mitosis: metaphase (organizational phase) The chromosomes line up the middle of the cell with the help of spindle fibers attached to the centromere of each replicated chromosome. http://www.bioweb.uncc.edu/1110Lab/notes/notes1/lab6.htm

Slide 13 -

Mitosis Metaphase Animal cell Plant cell Photographs from: http://www.bioweb.uncc.edu/biol1110/Stages.htm

Slide 14 -

3rd step in Mitosis: Anaphase (separation phase) The chromosomes split in the middle and the sister chromatids are pulled by the spindle fibers to opposite poles of the cell. http://www.bioweb.uncc.edu/1110Lab/notes/notes1/lab6.htm

Slide 15 -

Mitosis Anaphase Animal cell Plant cell Photographs from: http://www.bioweb.uncc.edu/biol1110/Stages.htm

Slide 16 -

4th step in Mitosis: Telophase The chromosomes, along with the cytoplasm and its organelles and membranes are divided into 2 portions. This diagram shows the end of telophase. http://www.bioweb.uncc.edu/1110Lab/notes/notes1/lab6.htm

Slide 17 -

Mitosis Telophase Animal cell Plant cell Photographs from: http://www.bioweb.uncc.edu/biol1110/Stages.htm

Slide 18 -

After Mitosis: Cytokinesis The actual splitting of the daughter cells into two separate cells is called cytokinesis and occurs differently in both plant and animal Cells. Beginning of cytokinesis in a plant: Beginning of cytokinesis in an animal: http://www.bioweb.uncc.edu/1110Lab/notes/notes1/lab6.htm

Slide 19 -

REMEMBER! Interphase Prophase Metaphase Anaphase Telophase Cytokinesis I Pray More At The Church Julie Camp’s mitosis power point - http://sciencespot.net/Pages/classbio.html#Anchor-mitosis

Slide 20 -

Meiosis Meiosis animation: http://www.youtube.com/watch?v=D1_-mQS_FZ0&NR=1

Slide 21 -

Vocabulary Diploid Haploid Germ cell Somatic cell Interphase Prophase Metaphase Anaphase Telophase Cytokinesis

Slide 22 -

ppt slide no 22 content not found

Slide 23 -

Meiosis Interphase Meiosis is preceded by interphase. The chromosomes have not yet condensed. http://morgan.rutgers.edu/MorganWebFrames/Level1/Page7/meiosis1.html

Slide 24 -

Meiosis Interphase The chromosomes have replicated, and the chromatin begins to condense. http://morgan.rutgers.edu/MorganWebFrames/Level1/Page7/meiosis1.html

Slide 25 -

Meiosis Prophase I The chromosomes are completely condensed. In meiosis (unlike mitosis), the homologous chromosomes pair with one another http://morgan.rutgers.edu/MorganWebFrames/Level1/Page7/meiosis1.html

Slide 26 -

Meiosis Metaphase I The nuclear membrane dissolves and the homologous chromosomes attach to the spindle fibers. They are preparing to go to opposite poles. http://morgan.rutgers.edu/MorganWebFrames/Level1/Page7/meiosis1.html

Slide 27 -

Meiosis Anaphase I The chromosomes move to opposite ends of the cell. http://morgan.rutgers.edu/MorganWebFrames/Level1/Page7/meiosis1.html

Slide 28 -

Meiosis Telophase I & Cytokinesis The cell begins to divide into two daughter cells. It is important to understand that each daughter cell can get any combination of maternal and paternal chromosomes. http://morgan.rutgers.edu/MorganWebFrames/Level1/Page7/meiosis1.html

Slide 29 -

Meiosis Prophase II The cell has divided into two daughter cells. http://morgan.rutgers.edu/MorganWebFrames/Level1/Page7/meiosis1.html

Slide 30 -

Meiosis Metaphase II As in Meiosis I, the chromosomes line up on the spindle fibers. http://morgan.rutgers.edu/MorganWebFrames/Level1/Page7/meiosis1.html

Slide 31 -

Meiosis Anaphase II The two cells each begin to divide. As in Meiosis I, the chromosomes move to opposite ends of each cell. http://morgan.rutgers.edu/MorganWebFrames/Level1/Page7/meiosis1.html

Slide 32 -

Telophase II & Cytokinesis With the formation of four cells, meiosis is over. Each of these prospective germ cells carries half the number of chromosomes of somatic cells. http://morgan.rutgers.edu/MorganWebFrames/Level1/Page7/meiosis1.html

Slide 33 -

Yvonne Norman G410 (Life Sciences for Middle School Educators) Senior – Portland State University February 2009

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