Practice 9_17_2009_exam1

Practice 9_17_2009_exam1 - A diploid, eukaryotic organism...

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A diploid, eukaryotic organism has 2n = 8 chromosomes a) How many bivalents are present in a nucleus at diplonema? b) How many chromatids are present in a pachytene nucleus? c) How many DNA molecules are present in a nucleus at zygonema? d) How many chromosomes will be present in telophase II of meiosis? 2. At three points during meiosis, events occur that will lead to gametes that differ from each other. Describe these three events? 3. Organize the following processes of meiosis in the order in which they occur: a) centromeres divide b) cells first become haploid c) homologous chromosomes separate d) chromosomes pair e) gamete nuclei are formed f) DNA replicates g)crossing over occurs. 4. A cell has four pairs of homologous chromosomes designated Aa, Bb, Cc and Dd, where A and a represent a pair of homologs. How many different gametes can this cell produce? 5. The following spore arrangement were obtained in the indicated frequencies from ordered tetrads in a cross between a Neurospora strain c/v which exhibits a
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Practice 9_17_2009_exam1 - A diploid, eukaryotic organism...

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