Procedure 4 Questions 1. The two daughter cells that result from Meiosis I are haploid and unique. a. Which event of Meiosis I results in the creation of haploid cells? That is, why are homologous pairs of chromosomes absent in Meiosis I daughter cells? b. Which event of Meiosis I results in the creation of unique daughter cells? That is, why don't the two daughter cells contain an identical assortment of chromosomes? 2. Explain how you can tell that the 4 daughter cells of Meiosis II are haploid. Hint: are homologous pairs present in the same cell? 3. Explain how you can tell that the 4 daughter cells of Meiosis II are genetically unique compared to each other. Hint: compare the chromosome appearance in each cell. 4. Explain how crossing over results in unique daughter cells at the end of meiosis:
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The event of Meiosis that results in the creation of haploid cells is Meiosis I, specifically during Anaphase I when homologous chromosomes are separated and pulled to opposite poles of the cell. This is why homologous pairs of chromosomes are absent in Meiosis Show more…
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Difference in DNA Between Parent Cell & Daughter Cells 8. Identify whether each process below occurs during mitosis, meiosis (remember meiosis has both PMAT I and PMAT II), or both. a. Sister chromatids separate b. Haploid cells are formed c. Homologous chromosomes pair d. 4 haploid cells are the final result e. Crossing over occurs f. 2 diploid cells are the final result 9. Fill in the blanks based on your knowledge of mitosis and meiosis. a. A human has 46 chromosomes in each body cell. How many chromosomes would be found in its daughter cells after mitosis? b. A fruit fly's gametes have chromosomes, because its body cells have 4 chromosomes. c. A kangaroo's somatic (body cells) cells have 12 chromosomes, so that means its sex cells have chromosomes. 10. Meiosis: What important event occurs during Prophase 1? Why is it important?
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INVESTIGATION 5—PART C: Modeling and Explaining the Events of Meiosis PROCEDURE 1. Work with a partner. 2. Use the pipe cleaners provided to model and explain the process of meiosis in a diploid cell with four pairs of homologous chromosomes (2n = 8). 3. Manipulate your chromosomes through the following stages: interphase prior to DNA replication (G1), interphase after DNA replication (G2), prophase I, metaphase I, anaphase I, telophase I, prophase II, metaphase II, anaphase II, telophase II. a. Ask your laboratory instructor about how to depict the process of crossing over. b. Keep your chromosomes in a condensed state between telophase I and prophase II. 4. Explain what is happening to the chromosomes in each stage that you are modeling. QUESTIONS 1. Your cell began with a total of eight different chromosomes (four homologous pairs). At the end of meiosis I, how many chromosomes are in each daughter cell? 2. Are the daughter cells generated by meiosis I haploid or diploid? Explain your reasoning. 3. In addition to crossing over, independent assortment also increases genetic diversity. What is independent assortment and when does it occur? 4. Sketch three different examples depicting how the process of independent assortment could have occurred in your modeled cell.
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