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  • Slide 1
  • Bellwork 2-4-2014 1.Look at the two different populations of organisms below: a.Which one is asexual and which one is sexual? b.Which one has variety and which once does not? AB
  • Slide 2
  • Missed work!! If you finish an assignment that was incomplete when I put in homework grades, turn it into the basket! All in class work can be completed for full credit! Find a friend in the class if you are missing a lot of work! Check grades
  • Slide 3
  • Vocab Review Chromosome two chromatids put together, one complete set of information Sister chromatids make up a chromosome, half of the information Homologous chromosomes multiple pairs of chromosomes (two chromatids each), some from mom and some from dad
  • Slide 4
  • Exploring Meiosis I You will be exploring meiosis I on your own with your NEW lab group today Following the guidelines at each lab bench, model EACH step of meiosis with the colored beads and chalk After each step, YOU MUST GET CHECKED and then draw the step on your worksheet with colored pencils
  • Slide 5
  • Your models Chromatid Chromosome Replication **You will have 4 of these in total, all different colors!
  • Slide 6
  • Check your drawings!
  • Slide 7
  • Once you are done Homework if not done in class Describe the steps of meiosis using COMPLETE SENTENCES
  • Slide 8
  • Bellwork 2-5-2014 1.At which stage in meiosis I does the exchange of information on chromosomes occur? 2.How many cells does meiosis I create? 3.Are the products of meiosis I identical or is there variety? *Check grades **Test-make-ups
  • Slide 9
  • Meiosis
  • Slide 10
  • Meiosis: Unit Vocabulary meiosistetradhaploid diploidsomatic cell homologous pairgametezygote crossing overProphase I and IIMetaphase I and II Anaphase I and IITelophase I and IIgenetic recombination sexual reproductionasexual reproduction independent assortment
  • Slide 11
  • Meiosis Video http://www.youtube.com/watch?v=wrxY4hjM Dfk
  • Slide 12
  • How much information? Whole set of DNA = 2n Diploid Half set = How to remember: Half Haploid Di = 2 n haploid
  • Slide 13
  • How much information? Talk with your neighbor: Are chromatids haploid or diploid? Are chromosomes (pair of sister chromosomes) haploid or diploid? n haploid! 2n diploid!
  • Slide 14
  • Pre Interphase! Draw a circle on top of your worksheet and label it pre-interphase What happens to chromatids in pre-interphase to get the results YOU drew in interphase?
  • Slide 15
  • Interphase Draw and label the centrioles on your Drawing How much information? 2n!! Diploid DNA replication
  • Slide 16
  • Prophase I Tetrads form and crossing over occurs Label the tetrads in your picture & where crossing over happens
  • Slide 17
  • Prophase I How much information? n or 2n?? 2n - Diploid!!!
  • Slide 18
  • Tetrads & Crossing Over Tetrads close association of sister chromatids on homologous chromosomes Crossing Over: Homologous chromosomes exchange small pieces, resulting in new chromosomes!
  • Slide 19
  • Crossing Over Must Happen Perfectly!!! What do we call the two pairs of chromosomes pictured? Homologous Chromosomes!
  • Slide 20
  • 20 Homologous Recombination I Where should the circled site on Chromo1 recombine with Chromo2? 1 2 3
  • Slide 21
  • Oooops... 2 This is what happens in the mutation that causes color blindness in males! Green opsin gene duplicated and got changed somewhere along the way to sense more in the red region.
  • Slide 22
  • 22 Short end of the stick http://www.blackwellpublishing.com/korfgenetics/figure.asp?chap=02&fig=Fig2-3
  • Slide 23
  • Metaphase I Homologous chromosomes line up at the metaphase plate How much info? 2n Diploid!
  • Slide 24
  • Anaphase I Homologous chromosomes move to opposite ends of the cell Independent assortment occurs creating new combinations! How much info? 2n Diploid!
  • Slide 25
  • Independent Assortment Chromosomes from mom & dad RANDOMLY move to one side or the other
  • Slide 26
  • Telophase I Cell walls begin to pinch inwards 2n Diploid! How much info?
  • Slide 27
  • (Cytokinesis I) Two daughter cells pinch off Talk to your neighbor How do they compare to one another? n (haploid) or 2n (diploid?
  • Slide 28
  • Why does genetic recombination matter? Your turn!!! You will get two homologous chromosomes with your partner that look like this Yellow: White: Red: Green: What traits do each potential individuals have?
  • Slide 29
  • Why does genetic recombination matter? Cross over at the indicated positions below Yellow: White: Red: Green: Now what traits do each potential individuals have?
  • Slide 30
  • Why does genetic recombination matter? Cross over at the indicated positions below Yellow: White: Red: Green: Now what traits do each potential individuals have?
  • Slide 31
  • Bellwork 2-6-2014 1.If you missed the drawings for meiosis I, get some colored pencils and copy it from your neighbor. I will stamp it. 2.Get your sentences out from yesterday if I didnt stamp them yet. 3.Can you find my mistake from yesterday? Extra credit to who figures it out first (hint: it has to do with the amount of information in one step but its not at the end of meiosis I!) 4.Get out your pink sheet and be ready to go through meiosis II!
  • Slide 32
  • Announcements Tomorrow we will be walking through the gym to see the science fair boards Test on meiosis next Wednesday Homework is coming on Monday! Dont get behind! Test make-ups
  • Slide 33
  • Once you are done Write a sentence explaining the steps of meiosis II! One sentence for each step. HOMEWORK IF NOT DONE IN CLASS!
  • Slide 34
  • Bellwork 2-7-2014 1.Have your sentences from meiosis I out if they have not been stamped yet as well as meiosis II sentences 2.Have pink sheet with drawings out for meiosis I and II to be stamped 3.Work on the questions at the end of your pink meiosis packet for bellwork. This will be stamped WHEN YOUR DONE!
  • Slide 35
  • Bellwork 2-10-2014 1.What is the difference between a homologous chromosome pair and a chromosome? 2.What is a tetrad? 3.Have sentences from meiosis II out to be stamped 4.Have green science fair sheet out to be stamped if I didnt stamp it Friday
  • Slide 36
  • Announcements Meiosis quiz Wednesday Essential question Drawing and binder check TODAY!
  • Slide 37
  • PRE - INTERPHASE INTERPHASE
  • Slide 38
  • PROPHASE Crossing over occurs between homologous pairs Tetrad= 2 homologous chromosome pairs (one from mom in each, one from dad in each): 4 chromatids
  • Slide 39
  • METAPHASE 1 (middle) ANAPHASE 1 (apart) Homologous chromosome pairs line up Spindles attach to chromosomes
  • Slide 40
  • TELOPHASE 1CYTOKINESIS Almost two cells
  • Slide 41
  • PROPHASE IIMETAPHASE II Spindles attach to chromatids
  • Slide 42
  • ANAPHASE IITELEPHASE II & CYTOKINESIS Chromatids separate
  • Slide 43
  • Prophase II Beginning with the end products of meiosis II Chromosomes are condensed and prepare for another division No crossing over!! n or 2n? 2n - Diploid!!
  • Slide 44
  • Metaphase II Chromosomes line up at the metaphase plate More similar to mitosis this time Not homologous pairs any longer n or 2n? 2n - Diploid!!
  • Slide 45
  • Anaphase II Chromatids move to either end of the cell n or 2n? 2n - Diploid!!
  • Slide 46
  • Telophase II Chromatids separate to individual cells n or 2n? n - haploid!!
  • Slide 47
  • (Cytokinesis) Individual cells form n or 2n? Talk with your neighbor: How do the cells compare to each other? How do they compare to the products of meiosis I?
  • Slide 48
  • What do we call these cells? These cells are called gametes they can be Eggs (from females) or Sperm (from males) n or 2n? They are haploid!!! Get half of information from mom, half from dad
  • Slide 49
  • Fertilization Making babies! Sperm + Egg = Zygote
  • Slide 50
  • Human Chromosomes! How many pairs? How many chromosomes? How many sex chromosomes? 23 46 2 How many undergo meiosis? All of them!
  • Slide 51
  • Chromosome vs. Chromatid and how they are used
  • Slide 52
  • Meiosis I vs. Meiosis II Products : What is divided : Crossing over? Amount of info: Spindles attach to:
  • Slide 53
  • Funny Meiosis Video http://www.youtube.com/watch?v=iCL6d0Ow Kt8 http://www.youtube.com/watch?v=iCL6d0Ow Kt8
  • Slide 54
  • Vocab activity You and a partner will get a sheet of card stock to draw a stage of meiosis I or II. You MUST label all parts of your drawing (homologous chromosomes, centrioles, cell pinching, metaphase plate etc.) When you and your partner/s are done, present to the class
  • Slide 55
  • Binder Check Bellwork (4 stamps) Notes Meiosis I and meiosis II notes (hand written) Homework/worksheets/labs Green variation activity with colors Pink meiosis packet with all drawings and stamps Green science fair worksheet Meiosis I and II sentences (handwritten)
  • Slide 56
  • Homework 1-10-2014 Orange meiosis worksheet due tomorrow! Tuesday Put homework and notes packet together and take home to study!
  • Slide 57
  • Bellwork 2-11-2014 1.What is being separated in meiosis I? a.Chromosomes b.Homologous chromosomes 2.What is being separated in meiosis II? a.Chromosomes b.Homologous chromosomes 3.What is the difference in the amount of information from meiosis I to meiosis II?
  • Slide 58
  • Presentations Present your stage of meiosis I or II
  • Slide 59
  • Slate Quiz! Look at the pictures on the following slides & name the stage of meiosis!
  • Slide 60
  • ????
  • Slide 61
  • Slide 62
  • Charades!
  • Slide 63
  • Unit Packet Notes on top (meiosis I and meiosis II) Homework/worksheets/labs on bottom Green variation activity Pink meiosis packet Green science fair worksheet Meiosis I and II sentences (handwritten) Orange homework multiple choice worksheet Yellow questions packet add tomorrow!
  • Slide 64
  • Work on yellow sheet Last 10 minutes Finish the first page (front and back) of the yellow sheet as your ticket out the door.
  • Slide 65
  • Bellwork 2-12-2014 1.Grab an article by the door, read it for bellwork and answer the following questions a.What was the main point the article was trying to make? b.Hypothesize how this might be possible given what we have learned so far.
  • Slide 66
  • Work on yellow sheet Work on the second sheet (front and back) of the yellow sheet You have 10 minutes
  • Slide 67
  • Turn in unit packets and bellwork Add yellow sheet to unit packet and turn into basket Add up bellworks (6 stamps) and write at the top
  • Slide 68
  • Unit Packet Notes on top (meiosis I and meiosis II) Homework/worksheets/labs on bottom Green variation activity Pink meiosis packet Green science fair worksheet Meiosis I and II sentences (handwritten) Orange homework multiple choice worksheet Yellow questions packet