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Page 54 of Spiral

Page 54 of Spiral. I can recognize the importance of meiosis in sexual reproduction. Meiosis. Section 11-4. 46. Box 40. Humans have 46 chromosomes in every cell of our bodies except the sex cells or gametes (eggs and sperm)- they have 23 chromosomes

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Page 54 of Spiral

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  1. Page 54 of Spiral • I can recognize the importance of meiosis in sexual reproduction.

  2. Meiosis Section 11-4 46 Box 40 • Humans have 46 chromosomes in every cell of our bodies except the sex cells or gametes (eggs and sperm)- they have 23 chromosomes • When a baby is conceived, an egg from mom and a sperm from dad, combine into the first cell of the new baby. 23+23 = 46 46 What would happen if the egg and sperm both had 46 chromosomes? Baby would have 92 chromosomes!! Disaster! 92 chromosomes = death, disease

  3. Phases of Meiosis Homologous = same chromosome, it just comes from different parents (mom or dad) • Meiosis (my-OH-sis) • Meiosis = process of reduction cell division where the # of chromosomes per cell is cut in ½ by the separation of homologous chromosomes • Meiosis involves 2 distinct divisions, • Meiosis I • Meiosis II • Results of Meiosis? = cells with a haploid (1n) number of chromosomes; produces gametes (egg & sperm cells) Box 46

  4. Flow Chart for Meiosis I P Interphase I M Prophase I A Metaphase I Anaphase I T 92 Telophase I &Cytokinesis 92 92 92 Humans = 2n = 46 46 P Prophase II A M T Telophase II & Cytokinesis Anaphase II Metaphase II 46 23 46 46 4 daughter cells with haploid # (1n) I then …PMAT…..PMAT

  5. Gamete Formation For Sexual Reproduction, where egg and sperm unite to make an embryo Box 72 • Why do we even have Meiosis? • To make gametes (eggs and sperm). • Male gametes = sperm • Female gametes = eggs Skip Box 59 Why do we need eggs and sperm?

  6. Remembering Meiosis • Mitosis is a process that occurs in almost every cell of your body (body cells), except the sex cells, or gametes. • Mitosis = My toe sis, it happens in your toes! • Meiosis is a process of cell division that doesn’t happen in your toes, it only happens in yoursex cells, gametes • Meiosis = My OH! Sis (as in uh-oh!) Box 40

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