1. Describe the steps of mitosis. 2. Describe what happens during interphase. 3. The progress of the cell cycle is tightly controlled. Describe what happens at the G2 control checkpoint. 4. Compare mitosis and meiosis. How are they similar? How are they different? 5. Describe 3 ways that sexual reproduction contributes to genetic diversity Solution 1. ANS: The steps of mitosis are Interphase, Preprophase, Prophase, Prometaphase, Metaphase, Anaphase, Telophase and Cytokinesis. 2. ANS: Inter phase is the time between mitosis events. In this the preparations for mitosis are made. It mainly consist three phases. They are G1 phase, S phase, and G2 phase. The key events taken placed during the time of inter phase A. all replication needed proteins are maked in this stage. B. DNA must be expanded and uncondensed. C. DNA is replicated. 3. ANS: During the cell cycle genetic information is evaluated at three internal checkpoints. The cell cycle is mainly controlled by three internal checkpoints they are... 1. G1 checkpoint 2. G2 checkpoint 3. M checkpoint G2 checkpoint: The G2 phase is the time during which a cell replicates its organelles in preparation for mitosis. This checkpoint can ensured that all of the chromosomes been replicated and that the replicated DNA is not damaged before cell enters mitosis. 4. ANS: Compare mitosis and meiosis: Similarities: Mitosis and meiosis both contains inter phase , pro phase , meta phase , anaphase , and telophase. Mitosis and meiosis both are involved in DNA replication. The chromosome number was same in each new cell. Differences: Mitosis taken placed in somatic cells and meiosis occurs in reproductive cells . In meiosis four daughter cells are formed but in mitosis, two daughter cells are formed. Cytokinesis occurs only once in mitosis, but in meiosis it taken placed once or twice. mitosis dividing cells be either diploid or haploid but in meiosis it only can be present in diploid condition. 5. ANS: Sexual reproduction contributes to genetic diversity: 1. Crossing over or recombination 2. Independent assortment 3. Random fertilization 4. Random mating 5. Diploidy or polyploidy.