112Chapter 3 •The Chromosomal Basis of Inheritancesomes 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. Ifthere are several possibilities, show them, too.36.In the species of Problem 35, you can introduceradioactivity by injection into the anthers at the Sphase before meiosis. Draw the four products ofmeiosis with their chromosomes and show whichare radioactive.37.The DNA double helices of chromosomes can bepartly unwound in situ by special treatments. Whatpattern of radioactivity is expected if such a prepa-ration is bathed in a radioactive pulse fora.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 enzymeand fractionated by size by electrophoresis, whatpattern of Southern hybridization is expected forthe probes cited in Problem 37?
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