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Unformatted text preview: 518 Chapter 15 Large-Scale Chromosomal Changes Draw diagrams to interpret these observations phy- logenetically, clearly indicating the relationships between the species. How would you go about proving that your interpretation is correct? (Problem 50 is adapted from A. M. Srb, R. D. Owen, and R. S. Edgar, General Genetics, 2d ed. W. H. Freeman and Company, 1965.) 51. There are six main species in the Brassica genus: B. carinata, B. campestris, B. nigra, B. oleracea, B. juncea, and B. napus. You can deduce the interrelationships between these six species from the following table: a. What types of linear asci (see Chapter 4) do you predict, and in what frequencies, in a normal cross of un-3 ad-3 3 wild type? (Specify genotypes of spores in the asci.) b. Most of the time such crosses behave predictably, but in one case, a standard un-3 ad-3 strain was crossed with a wild type isolated from a field of sug- arcane in Hawaii. The results follow: un-3 ad-3 un-3 ad-3 un-3 ad-3 un-3 ad-3 un-3...
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- Spring '08