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Sexual Reproduction and Meiosis
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Sexual Reproduction How new organisms are produced 2 new cells come together Formed from cells in reproductive organs
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Sex Cells in Humans Male reproductive organs contain sex cells called sperm Female reproductive organs contain sex cells called eggs
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Meiosis I Chromosomes become duplicated There are 4 Phases: Prophase I, Metaphase I, Anaphase I and Telophase I
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Prophase I Duplicated chromosomes are visible under a microscope as a chromatid Duplicated chromosome comes near its duplicated mate
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Metaphase I Duplicated chromosome pairs line up in center of cell The centromere of each pair becomes attached to one spindle fiber The chromatids do not separate
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Metaphase I
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Anaphase I 2 pairs of chromatids move away to opposite ends of the cell Duplicated chromosome still have 2 chromatids
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Telophase I The cytoplasm divides 2 new cells form New cell has 1 duplicated chromosome from each similar pair
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Telophase I
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Meiosis II Begins after 2 new cells form in Meiosis I Chromatids of each chromosome will be separated during this division Occurs in 4 phases: Prophase II, Metaphase II, Anaphase II, Telophase II
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Prophase II The duplicated chromosomes and spindle fibers reappear in each new cell
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Metaphase II Duplicated chromosomes move to the center of cell Each centromere attaches to 2 new spindle fibers
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Anaphase II Centromere divides Chromatids separate and move to opposite ends of the cell Each chromatid is now an individual chromosome
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Telophase II Spindle fibers disappear Nuclear membrane forms around the chromosomes at each end of the cell Cytoplasm divides
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How Fast Does Meiosis Happen? Just how fast does meiosis happen? Is it faster than a car going 100 mph or is it slower than a turtle crawling? Lets find out!
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Meiosis! Meiosis! Meiosis! Now that you are an expert on Meiosis, let’s see how well you can identify each step Name each of the following steps from Meiosis I or II.
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Name this step. Metaphase 2! That’s right!
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Which step is this? Telophase I! That’s right!
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Is this step from Meiosis I or II? Meiosis I! That’s right!
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Meiosis! Cells have been divided, chromosomes duplicated, we have reached the end of meiosis…. See you next class!
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Webliography Pictures taken from Microsoft Clip Art http://www.sumanasinc.com/webcontent/animations /content/meiosis.htmlhttp://www.sumanasinc.com/webcontent/animations /content/meiosis.html http://www.uic.edu/classes/bios/bios100/lecturesf04 am/prophase1m.jpghttp://www.uic.edu/classes/bios/bios100/lecturesf04 am/prophase1m.jpg www.biologycorner.com/bio1/qz_meiosis.html Information taken from Glencoe LifeScience Book A http://videos.howstuffworks.com/hsw/5988-mitosis- and-meiosis-metaphase-one-video.htmhttp://videos.howstuffworks.com/hsw/5988-mitosis- and-meiosis-metaphase-one-video.htm http://www.usd.edu/~bgoodman/cell.JPG
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