Introduction to Genetic Analysis 113

Introduction to Genetic Analysis 113 - 44200_03_p73-114...

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112 Chapter 3 The Chromosomal Basis of Inheritance somes at prophase and telophase of the Frst and sec- ond mitotic divisions after the radioactive treatment. If they are radioactive, show it in your diagram. If there are several possibilities, show them, too. 36. In the species of Problem 35, you can introduce radioactivity by injection into the anthers at the S phase before meiosis. Draw the four products of meiosis with their chromosomes and show which are radioactive. 37. The DNA double helices of chromosomes can be partly unwound in situ by special treatments. What pattern of radioactivity is expected if such a prepa- ration is bathed in a radioactive pulse for a. a unique gene? b. dispersed repetitive DNA? c. ribosomal DNA? d. telomeric DNA? e. simple-repeat heterochromatic DNA? 38. If genomic DNA is cut with a restriction enzyme and fractionated by size by electrophoresis, what pattern of Southern hybridization is expected for the probes cited in Problem 37?
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