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Meiosis Day 3,4,5 & Science Fair walk- through
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Bellwork 1. Grab a closure from the front basket. Add at least 2 sentences to it to make it more complete or more correct. 2. Complete this phrase on your bellwork sheet: Meiosis creates _______ cells like _____ and _____. It begins with __ diploid cell and ends with ___ _________ cells. Have out: book, Meiosis notes, and orange worksheet from yesterday
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Announcements & Purpose Review meiosis Use book to fill in worksheet Quiz on Meiosis Thursday Friday: science fair walk through.
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Finger Meiosis = 2 (chromatid) chromsomes in each cell Hold up 1 pointer finger= this is chromosome 1 from your dad. Hold up other pointer finger= this is chromosome 1 from your mom =homologous chromosomes Have them replicate (hold up middle fingers too) Recombination (mingle them together) Meiosis 1: Pull hands apart Meiosis 2: pull fingers apart = 1 chromatid chromosome in each cell
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9. 9.Meiosis 10. 10.Sexual Reproduction 11. 11.Asexual Reproduction 12. 12.Chromatid 13. 13.Chromosome 14. 14.Genetic Recombination 15. 15.Fertilization 16. 16.Independent Assortment Write Down… ALL THE Key Terms! 1.Prophase I 2.Metaphase I 3.Anaphase I 4.Telophase I 5.Prophase II 6.Metaphase II 7.Anaphase II 8.Telophase II 17.Ploidy 18.Haploid (n) 19.Diploid (2n) 20.Tetrad 21.Homologous Pair 22.Crossing Over 23.Somatic Cell 24.Germ Cell 25.Gamete 26.Zygote nb - You have to actually define them to get credit at the end of the unit
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SLATE REVIEW - Have out worksheets/notes
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The merging of an egg and a sperm is known as: A) a zygote B) a gamete C) a tetrad D) a somatic cell
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Haploid (1n) or diploid, (2n) metaphase I, metaphase II, anaphase I, telophase I
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An egg cell is an example of A) a zygote B) a gamete C) a tetrad D) a somatic cell
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During ‘crossing over’… A) genes are lost or deleted B) some genes may move to a homologous chromosome C) homologous pairs may leave the cell D) chromosomes will be in Metaphase II
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Haploid (1n) or diploid, (2n) metaphase I, metaphase II, anaphase I, telophase I
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In your body, your skin cells are: A) somatic B) a 1n gamete C) a 2n gamete D) a gamete
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In asexual reproduction, the offspring are: A) Unique from each other B) Identical to the parents C)Unique from their parents D) Half as many chromatids
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When homologous chromosomes line up: A. Male/female chromosomes will randomly be on either side B. The paternal chromosomes will be on the left C. Maternal chromosomes will be on the right D. homologous chromosomes don’t line up
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Metaphase I
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METAPHASE 1 ANAPHASE 1
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(choose all that apply) A sperm cell is: A) always diploid B) always haploid C) always a gamete D) half the genetic info. of it’s parent
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P. 116-117 Use book to fill in front side of worksheet Check: Did you label INTERPHASE & does it have original # of chromatids before replication? How many chromatids did you start out with? Your final number should be half of that If you copied book directly you should start with 4 original chromatids.
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Using book, Define the following vocab on the back of your white Meiosis notetaker *Chromatid: is one copy of a duplicated chromosome DiploidHaploidGamete *Zygote: the initial cell formed when two gamete cells are joined by means of sexual reproduction. Tetrad *Somatic Cell: ‘normal’ body cell Homologous pairs:
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Announcements & Purpose Friday: science fair walk through. Meiosis exam: MONDAY
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At top of page in small writing: Materials: -white board to be drawn on (cells, spindle fibers) -chalk= represents centriole -lengths of 8 beads= chromatid Chromosome #Mom’s ColorDad’s color 1REDYELLOW 2WHITEGREEN
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mMaterials: -white board to be drawn on (cells, spindle fibers) -chalk= represents centriole/centrisome -lengths of 8 beads= chromatid MEIOSIS w/ beads! Chromosome #Mom’s ColorDad’s color 1REDYELLOW 2WHITEGREEN Create: Meiosis drawing Label: homologous chromosomes Chromosome # and from mom/dad, (in at least 2 phases) & crossing over Option 1: draw & label each step Option 2: take cellphone photos, e-mail it to yourself at school/ print out and label
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Bellwork 1.What are ‘homologous pairs of chromosomes’? Draw an example 2.What is a somatic cell? How does it differ from a gamete? 3.What is the final product of meiosis? 4.What is your favorite thing you did this weekend?
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Announcements & Purpose Review meiosis -Go over Meiosis Bead activity -Slate review -Create a quiz -Group slate review (USING QUIZ) Quiz on Meiosis TOMORROW
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Check your Meiosis Bead activity -Fill in names of each step *Check that your drawing is correct Holepunch and put in binder at front.
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INTERPHASE
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PROPHASE Crossing over occurs Tetrad= 2 homologous chromosome sets: 4 chromatids
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METAPHASE 1 ANAPHASE 1
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TELOPHASE 1CYTOKINESIS
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PROPHASE1IMETAPHASE II
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ANAPHASE IITELEPHASE II & CYTOKINESIS
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Meiosis I splits the diploid cell into two haploid cells, which in turn go through meiosis II to produce a total of 4 haploid genetically-different cells. Meiosis II is very similar to mitosis, except that in meiosis II the nuclei start out as haploid. The reason it is haploid after meiosis I is because each cell has one chromosome set. two sister chromatids still connected at the kinetochore (a dyad) is equivalent to one chromosome. they aren't individual chromosomes until they split during meiosis II.
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PROPHASE Crossing over occurs Tetrad= 2 homologous chromosome sets: 4 chromatids =2n 2 identical chromatid= 1 chromosome 2 identical chromatid= 1 chromosome
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TELOPHASE 1CYTOKINESIS Tetrad= 2 homologous chromosome sets: 4 chromatids =1n Tetrad= 2 homologous chromosome sets: 4 chromatids =1n
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SLATE REVIEW - Have out worksheets/notes
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The merging of an egg and a sperm is known as: A) a zygote B) a gamete C) a tetrad D) a somatic cell
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Haploid (1n) or diploid, (2n) metaphase I, metaphase II, anaphase I, telophase I
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An egg cell is an example of A) a zygote B) a gamete C) a tetrad D) a somatic cell
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During ‘crossing over’… A) genes are lost or deleted B) some genes may move to a homologous chromosome C) homologous pairs may leave the cell D) chromosomes will be in Metaphase II
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Telophase II
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Haploid (1n) or diploid, (2n) metaphase I, metaphase II, anaphase I, telophase I
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In your body, your skin cells are: A) somatic B) a 1n gamete C) a 2n gamete D) a gamete
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In asexual reproduction, the offspring are: A) Unique from each other B) Identical to the parents C)Unique from their parents D) Half as many chromatids
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Anaphase II
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When homologous chromosomes line up: A. Male/female chromosomes will randomly be on either side B. The paternal chromosomes will be on the left C. Maternal chromosomes will be on the right D. homologous chromosomes don’t line up
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Metaphase II
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METAPHASE 1
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ANAPHASE 1
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Metaphase I
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What is a tetrad? Homologous chromosomes that pair up in a set during prophase 1
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End of: Meiosis 1 or Meiosis II?
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(choose all that apply) A sperm cell is: A) always diploid B) always haploid C) always a gamete D) half the genetic info. of it’s parent
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Anaphase I _____________ _____________ occurs creating _____combinations! Independent Assortment new
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At the end of Telophase I, there are: A) 4 haploid daughter cells B) 2 haploid daughter cells C) 4 diploid daughter cells D) 2 diploid daughter cells
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At the end of Telophase II, there are: A) 4 haploid daughter cells B) 2 haploid daughter cells C) 4 diploid daughter cells D) 2 diploid daughter cells
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Meiosis quiz 1. Create a 10 question quiz (with answers on the back) Include at least 2 drawing questions (a drawing of a phase and ask them to label it) Include the following vocab: -Somatic -Sexual reproduction -Asexual reproduction -Crossing over -Gamete -Homologous chromosomes -Diploid -Haploid
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Bellwork After stamp switch quiz with a partner or group mate and answer the questions, then fill in the following on your bellwork: 1.Choose the most difficult question and write why it was difficult. 2. Choose the most simple question and write why it was simple. 3. Why is creating a quiz a valid way to study for an exam?
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Announcements & Purpose Review meiosis Use book to fill in worksheet Quiz on Meiosis Thursday Friday: science fair walk through.
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Whoa-no-mei-oh-sis. http://www.youtube.com/watch?v=iCL6d0Ow Kt8&feature=player_embedded http://www.youtube.com/watch?v=iCL6d0Ow Kt8&feature=player_embedded
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Genetics- what do you know?
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Closure
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