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Chapter 8 Review

Chapter 8 Review. 11/18/08. Questions. 1. Ordinary cell division produces 2 daughter cells that are genetically identical – name 3 functions of this type of cell division 2. During what parts of the cell cycle does each Ch consist of 2 chromatids

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Chapter 8 Review

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  1. Chapter 8 Review 11/18/08

  2. Questions 1. Ordinary cell division produces 2 daughter cells that are genetically identical – name 3 functions of this type of cell division 2. During what parts of the cell cycle does each Ch consist of 2 chromatids 3. An organism called a plasmodial slime mold is one huge cytoplasmic mass with many nuclei. Explain what change in the ‘cell cycle’ caused this? 4. In what sense are the 2 daughter cells produced by mitosis identical? 5. __ is to somatic cells as haploid is to ___.

  3. Answers 1. Cell replacement, growth, asexual reproduction 2. From the end of the S phase (interphase) until the beginning of the anaphase in mitosis. 3. Mitosis occurs repeatedly – without cytokinesis 4. They have identical genes (DNA) 5. Diploid; gametes

  4. Questions 1. Name 2 events during meiosis that contribute to genetic variety among gametes. During what stages of meiosis does each occur? 2. How does the karyotype of a human female differ from that of a male? 3. What is the chromosomal basis of Down syndrome? 4. Explain how nondisjunction in meiosis could result in a diploid gamete. 5. Which 2 phases of mitosis are essentially opposites in terms of the nucleus? 6. If a somatic cell in a dog has 78 Chs, a dog sperm would contain __ Chs.

  5. Answers 1. Crossing over between homologous Chs during prophase I and independent orientation of tetrads at metaphase I 2. A female has two X Chs; a male has an X and a Y 3. 3 copies of Ch 21 (trisomy21) 4. A diploid gamete would result if there were nondisjunction of all the Chs during meiosis I or II 5. Prophase and telophase 6. 39

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