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Catalyst 5/7/14 Go to class website: and scroll down to Catalysts. Complete the questions and press submit. Question: When does “cross over” happen in meiosis? Why is this important for biodiversity among sexually reproducing organisms?
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Biology Agenda 5/7/14 Catalyst Announcements
Birth Control Method Presentations Meiosis Discussion Meiosis Classwork (WebQuest) Checkpoint Human Body Model Project Work Time (Period 7)
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Male Reproductive System Overview
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Female Reproductive System Overview
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Meiosis Animation
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Objectives We will be able to
Create a persuasive infomercial or pamphlet on a method and brand of a contraception product. Explain the process of meiosis and its importance in sexual reproduction.
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Definitions Diploid Cells—cells that have pairs of chromosomes. There are 2 of each chromosome in diploid cells. Haploid Cells—cells that have only one of each chromosome. Haploid cells are used for sexual reproduction.
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Creating Cells for Sexual Reproduction
Meiosis: Creating Cells for Sexual Reproduction
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Prophase I Chromosomes are already copied Centrioles separate
Nuclear membrane breaks down
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Metaphase I Chromosome pairs line up next to each other
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Anaphase I Chromosome pairs split Sister chromatids stay connected
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Telophase I Cell starts to divide in two
Nuclear membranes start to form again
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Prophase II Cells have one set of sister chromatids
Nuclear membrane breaks down Centrioles separate
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Metaphase II Sister chromatids line up at the middle of the cell
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Anaphase II Sister chromatids divide
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Telophase II Cells start to split in two
Each cell has one set of chromosomes—it is a haploid
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