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Monday- Good Morning

Monday- Good Morning. Take out: notebook, agenda, pen/pencil Homework: Watch 3 Mitosis Videos on delgenioscience.weebly.com . Write a short summary for each video (1-3 sentences each) on paper. Bellwork : Write the new objective and page number in your table of contents:

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Monday- Good Morning

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  1. Monday- Good Morning

  2. Take out: notebook, agenda, pen/pencil • Homework: Watch 3 Mitosis Videos on delgenioscience.weebly.com. Write a short summary for each video (1-3 sentences each) on paper. • Bellwork:Write the new objective and page number in your table of contents: I can describe the processes of mitosis/asexual reproduction and meiosis/ sexual reproduction……………………………………………... Pg# (cell cycle, mitosis, asexual reproduction, cytokinesis, chromatid, sister chromatids, chromosomes, sexual reproduction, meiosis, gametes, haploid, fertilization, diploid, zygote, somatic cells) *Then, turn to a new page of notes and title the page: MITOSIS Bellringer

  3. http://www.youtube.com/watch?v=gwcwSZIfKlM Introduction video (8m)

  4. Period of time from one division to the next Unicellular division results in formation of new individuals of the species Cell Cycle Multicellular division results in replacement of old or damaged cells Process by which the nucleus divides while maintaining number of chromosomes Mitosis Cytokinesis Division of the cytoplasm Asexual Reproduction Reproduction that only involves one parentso therefore no special reproductive organsare needed

  5. Nuclear DNA wound around proteins Chromatid Sister Chromatids Two attached chromatids 5 phases in MITOSIS Interphase- cell grows, chromosomes copy themselves

  6. Sister Chromatids Centromere Nuclear DNA wound around proteins Chromatid Sister Chromatids Two attached chromatids 5 phases in MITOSIS Interphase- cell grows, chromosomes copy themselves Prophase-“prepare”-double chromosomes form

  7. Nuclear DNA wound around proteins Chromatid Sister Chromatids Two attached chromatids 5 phases in MITOSIS Interphase- cell grows, chromosomes copy themselves Prophase-“prepare”-double chromosomes form Metaphase- “middle”- Centromeres line up in the middle of the cell.

  8. 5 phases in MITOSIS Interphase- cell grows, chromosomes copy themselves Prophase-“prepare”-double chromosomes form Metaphase- “middle”- Chromosomes line up in the middle of the cell. Anaphase- “away”- daughter chromosomes move to opposite sides of the cell

  9. 5 phases in MITOSIS Interphase- cell grows, chromosomes copy themselves Prophase-“prepare”-double chromosomes form Metaphase- “middle”- Chromosomes line up in the middle of the cell. Anaphase- “away”- daughter chromosomes move to opposite sides of the cell Telophase- “two”- chromosomes uncoil and two new cells have formed!

  10. Mnemonic Device She had it coming!! An easy way to remember theorder of the phases in mitosisis to think: I PUNCHED MY AUNT TILLY!!

  11. Mitosis in Plants Same as mitosis in animals except: • Plants have no centrioles – spindle fibers take their place • Asters do not form • Cell wall does not pinch because it is too rigid • Cell plate divides the cell into two

  12. BACTERIA YEAST PLANTS D. Protein that causes cells to go through cell cycle is called cyclin * Asexual Reproduction Occurs only through the process of mitosis • Each offspring has the same genetic information Where can asexual reproduction be found?

  13. What are the stages of Mitosis? (Once I see the correct answer, you may pack up.) Summary- on your own

  14. Tuesday- Good Morning

  15. Take out: last night’s homework, notebook, agenda, pen/pencil • Homework: mitosis worksheet • Bellwork:Answer this FCAT Question: Bellringer

  16. Any comments/ questions about last night’s videos? Homework Review

  17. Introduction

  18. http://www.youtube.com/watch?v=L0k-enzoeOM Mitosis video (first 6 min, then 8:30)

  19. Look at the papers, read the steps of mitosis, and answer the questions together. Be prepared to answer to the class. With ONE Table Partner

  20. Wednesday- Good Morning

  21. Take out: last night’s homework, notebook, agenda, pen/pencil • Homework: Look at meiosis videos on delgenioscience.weebly.com • Bellwork: • 1. Open to a new page of notes and title the page: MEIOSIS • 2. Answer this FCAT Question on today’s date in your agenda: Bellringer

  22. Homework Review

  23. http://www.youtube.com/watch?v=toWK0fIyFlY Meiosis Introduction Video (7 min)

  24. Parent cell – chromosome pair Chromosomes copied 1st division - pairs split Meiosis 2nd division – produces 4 gamete cells with ½ the original no. of chromosomes

  25. SEXUAL REPRODUCTION Sex cells formed by meiosis Requires 2 parents Offspring not identical Meiosis The process that results in the formation of gametes Gametes Sex cells, egg or sperm, which have haploid chromosomes Haploid Haploid means HALF, as in the number of chromosomes, written as n

  26. n n 2n Fertilization The union of an egg and a sperm Zygote The cell that is formed when the egg becomes fertilized by thesperm. This results in a full set of chromosomes. Somatic Cells All body cells except for sex cells that have diploid chromosomes Diploid Diploid means they have chromosome found in pairs, written as 2n

  27. Homologous Chromosomes Similar chromosomes that are found in pairs. The paired chromosomes come from the mother and father. * Human body cells have 46 chromosomes each * Human body cells have 23 homologous pairs Meiosis and Fertilization Important for survival of many species, because these processesresult in genetic variation of offspring. Meiosis A kind of cell division that results in gametes (sex cells) withhalf the number of chromosomes.

  28. A. Gametes do not have homologous pairs, but instead they have only half the chromosomes from each pair. Gametes are referred to as haploid (n). B. When fertilization occurs, the zygote will have a normal number of chromosomes (2n). C. In meiosis, specialized cells divide 2 times producing 4 daughter cells.

  29. What is one difference between mitosis and meiosis? Summary

  30. Thursday- Good Morning

  31. Take out: last night’s homework,notebook, agenda, pen/pencil • Homework: meiosis wosksheet • Bellwork: • Answer this FCAT Question: Bellringer

  32. Questions/comments about last night’s homework. Homework Review

  33. What are the stages of mitosis (from Monday/Tuesday)? • 1. • 2. • 3. • 4. • 5. • In mitosis, a cell replicates into the same cell. In meiosis, a cell reproduces and becomes 4 different cells. Which gives a species more genetic variation (differences in genes), mitosis or meiosis? How do you know? Introduction

  34. http://www.youtube.com/watch?v=D1_-mQS_FZ0 Meiosis Introduction video (2 min)

  35. Phases of Meiosis (2 Cell divisions – Meiosis I & Meiosis II) MEIOSIS I 1. Prophase I Homologous chromosomes pair together to form tetrads During Prophase I, crossing over occurs between homologouschromosomes and genes are exchanged causing genetic variation

  36. 2. Metaphase I Spindle fibers attach to chromosomes and line them up in themiddle of the cell. 3. Anaphase I The fibers pull the homologous chromosomes apart. This is called disjunction. Chromosomes move toward opposite sidesof the cell.

  37. 4. TelophaseI During Telophase I and cytokinesis, the nuclear membrane formsand the cell splits into two new cells. **** The Chromosome number is reduced to half during Meiosis I forming haploid (n) daughter cells

  38. MEIOSIS II 5. Prophase II Spindle fibers form and attach to double stranded chromosomes 6. Metaphase II Chromosomes line up in the middle of the cell

  39. 7. Anaphase II Sister chromatids separate and move towards opposite sides of the cell 8. TelophaseII Cells divide, resulting in 4 haploid cells – gametes (sex cells)

  40. K K K K K K K K Polar Bodies Egg Males form 4 haploid cells which develop into 4 sperm Females form 4 haploid cells which develop into 1 egg and3 small polar bodies Small polar bodies are not used and break down.

  41. http://www.youtube.com/watch?v=vA8aMpHwYh0 How meiosis happens (3 min)

  42. Diagram/ Draw the stages of meiosis. Name each stage, then write a short description of what happens during that stage. On Your Own

  43. Friday- Good Morning

  44. Take out: last night’s homework, notebook, agenda, pen/pencil • Homework: Review notes and go on website. • Bellwork: • On a new paper, title the page MITOSIS VS. MEIOSIS • Answer this FCAT Question: Bellringer

  45. Homework Review

  46. http://www.youtube.com/watch?v=Q6ucKWIIFmg • Introduction Video0 Meiosis (2 min) Introduction Video0 Mitosis (5 min) http://www.youtube.com/watch?v=GK3eHNu9zsA

  47. What are 3 differences between mitosis and meiosis? • 1. • 2. • 3. Introduction Question

  48. Mitosis vs. Meiosis

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