2. What is the function of mitosis in a cell that is…
2. What is the function of mitosis in a cell that is about to divide? bi 101.docx Download Attachment This is an unformatted preview. Please download the attached document for the original format. Table 1: Number of cells observed in each stage of the cell cycle (2 pts) Number of cells in Total number Stage Predicted % stage of cells counted* Interphase 65 Prophase 65 Metaphase 65 Anaphase 65 Telophase 65 Totals Calculated % 65 NOTE: You do not have to draw the cells in each of the stages. Questions (6 pts) 1. What stage of the cell cycle (not just mitosis) were most of the onion root tip cells in? Does this make sense? Why? Cite source(s) used. 2. What is the function of mitosis in a cell that is about to divide? Cite source(s) used. 3. How accurate were your time predictions, based on your data, for each stage of the cell cycle? Lab 12 Experiment 1: Meiosis Read through the Lab 12 Introduction material and the instructions for the Lab 12 Experiment 1. Pay attention to the added information under the Week 4 Experiment link regarding these experiments! In the table below, describe the major events that take place in each stage of Meiosis and indicate the number of chromosomes in each. Cite your sources! (14 pts) Phase Major Events # of Chromosome s in each cell Meiosis I Prophase I Nuclear membrane breaks down and chromosomes condense. Two sets of homologous chromosomes are attached at the centromere. Crossing over will occur between the homologous pairs. 4 Metaphase I Anaphase I Telophase I Meiosis II Prophase II Metaphase II Anaphase II Telophase II Sources used: Questions (12 pts) 1. Name at least two differences between Meiosis I and Meiosis II in terms of what is produced and what occurs with the chromosomes. Cite source(s) used. 2. Name and briefly describe two processes that occur during meiosis that contribute to genetic variation. Cite source(s) used. 3. At the beginning of meiosis I are the cells diploid or haploid? What are they at the beginning of meiosis II? 4. Why is it necessary to reduce the chromosome number of gametes (egg and sperm), but not other cells of an organism? Cite source(s) used. 5. If humans have 46 chromosomes in each of their body cells, determine how many chromosomes you would expect to find in the following cells: Sperm _______________ Egg _________________ Daughter cell from mitosis __________ Daughter cell from Meiosis II __________ 6. Investigate one of the diseases from the following list. Include the following: • Name of the disease or disorder • What is the type of mutation and when might it occur? • What chromosome is affected? • What are the consequences? • What is the incidence rate of this disease or disorder? Down Syndrome Jacobs Syndrome Patau Syndrome Cystic fibrosis Turner Syndrome Triple X Hemophilia Prader-Willis Syndrome Klinefelter Syndrome Edward Syndrome Cri-du-chat Syndrome Fragile X Remember to properly cite your sources! (Minimum of 250 words) (6 pt)