Answers, Chapter 2 Questions Please work the following questions from Chapter 2: 3, 7, 10, 14, 16, and 25 Below are the answers to the questions not provided by the book 7. Interphase is the stage in the cell cycle (Figure 2.13a) between either mitosis or meiosis, when the chromosomes are not condensed and cannot be seen as distinct entities. The stages of interphase include G 1 , S, and G 2 . By far, for geneticists, the important event that occurs in interphase is DNA replication during the S period. Cell cycle stages: S = period of time for DNA replication resulting in doubling the amount of DNA and the number of chromosomes, G 1 and G 2 = periods of time before and after (respectively) DNA replication, M = either mitosis or meiosis depending upon the cell type (Figure 2.13a). Chromosomes are condensed during mitosis and meiosis resulting in an inability to either replicate or express DNA. Only at the other stages (S, G 1 , and G 2 = interphase) can genes be expressed. 25. Focus only on metaphase of meiosis and mitosis (Figure 2. 20).
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This note was uploaded on 03/30/2008 for the course BIOL 2004 taught by Professor Jofalkinham during the Spring '08 term at Virginia Tech.