The Role of Mitosis

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2.5 Cell Division Questions 1. The graph below shows how the quantity of DNA, measured in arbitrary units, varies with time during the different phases of the cell cycle in an animal cell. [pic] a. Interphase is made up of two growth phases, G1 and G2, separated by an intermediate phase, S. i. Explain what is happening within the cell during phase S. (2) ii. State one process other than cell growth, which occurs during phase G2. (1) b. Account for the changes in the quantity of DNA in the cell during mitosis. (2) 2. The diagrams below represent the chromosomes during stages in the process of mitosis. [pic] a. Write the letters in the order that represents the sequence in which these stages occur. (1) b. Explain the significance of mitosis in living organisms. (3) 3. Cell A in the diagram below has two pairs of chromosomes. Cell B, C and D have each arisen from A by cell division. [pic] For each of the cells labelled B and C, identify the type of cell division, which has occurred to produce the cell. In each case give a reason for your answer. (2) 4. Read through the following passage on the cell cycle and mitosis, then write on the dotted lines the most appropriate word or words to complete the passage. (6) In the cell cycle, replication of DNA takes place during .......................a.............................. At the beginning of prophase the chromosomes become visible and can be seen to consist of two ..................b...........................joined at the ......................c............................... The ........................d.................................. and nuclear membrane disappear

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