C Meiosis Chapter 13 1 Use The Socks Again For This Activity Remember That Cell Division Begins After The Cell Has Go 1 (62.38 KiB) Viewed 10 times
C Meiosis Chapter 13 1 Use The Socks Again For This Activity Remember That Cell Division Begins After The Cell Has Go 2 (49.38 KiB) Viewed 10 times
C. Meiosis-CHAPTER 13 1. Use the socks again for this activity. Remember that cell division begins after the cell has gone through S phase. Be sure your chromosomes are duplicated with a rubber band centromere holding the chromatids together. 2. We will keep track of maternally derived and paternally derived chromosomes in this activity. Take one of each homologous pair and place a small piece of TAPE on both chromatids (this will represent the chromosomes from one parent, while the others without tape will represent the chromosomes from the other parent). Then place the chromosome, tape side down (so you can't see it). Ignore the tape until instructed not to. 3. Arrange the chromosomes as they would appear in prophase 1. How do the chromosomes find their homolog? In males of the species, how can the X and the Y chromosome pair up? 4. In this activity, we will ignore crossing over in prophase I, but comment on what would actually happen in the cell at this stage 5. As you go through this activity, fill in the chart below: Number of Chromosomes per cell Stage Prophase I Metaphase I Anaphase I Telophase I (after cytokinesis) Prophase II Metaphase II Anaphase II Telophase II (after cytokinesis) Number of Chromatids (DNA molecules) per cell 4
6. Continue to move through metaphase I, anaphase I and telophase L. After cytokinesis, how many chromosomes are in each cell? Is this the diploid or haploid number? 7. Now continue through meiosis II (you need only continue with one cell, if you like). How is metaphase II different than metaphase I? How is anaphase II different than anaphase I? 8. How many chromosomes are in each cell after telophase II cytokinesis? Is this the diploid or haploid number? 9. Which round of meiosis (I or II) more closely resembles mitosis? Why? 10. What is the genetic relationship between the daughter cells (are they the same or different)? Look at "tape" vs. "no tape," and don't forget- we did not mimic crossing over in prophase I 11. Comment on how diversity is achieved in sexually reproducing organisms (meiosis provides two key steps: another occurs after meiosis- identify all three).
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