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AGR 3303 (3 credits) University of Florida - Fort Lauderdale  |
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| Below is exam #3 Part B for 1993, Advanced
genetics |
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AGR 3303 - Genetics 15 Nov 1993 University of Florida - Fort Lauderdale Exam #3 B: ADVANCED GENETICS (take home)
Open book exam, chapters 6, 17, 19, and 20. Be prepared to defend your answers.
Linkage Here are the results from a crossing experiment to determine linkage of three genes. The following genotypes were detected among the gametes from a heterozygous plant (coupling phase), based on a homozygous recessive tester. Show your work. ABC 347 abc 357 aBC 66 ABc 14 AbC 66 Abc 68 aBc 67 abC 15 ____ Total=1000
1. What is the order of the three genes?
2. What is the map distance from gene B to gene C?
3. What is the map distance from gene B to gene A?
4. What is the role of glucose in the catabolite repression system? Describe the sequence of events involving the lac operon, which occur when glucose is in high concentration in E. coli. Make sure to mention the regulatory consequence of high glucose and several main chemical interactions involving the lac operon. (Use text or illustration, or a combination.) (5 pts.)
5. Why would mutagens frequently cause cancer? Provide specific examples based on knowledge of genetics. (5 pts.) 6. Different organisms have developed different ways of regulating the flow of genetic information. Justify the differing methods of genetic regulation needed by two organisms, a prokaryote (e.g., E. coli) and a eukaryote (e.g., a human being), based on differences in characteristics known for these two organisms. Make sure to mention chromosome structure, cellular organization, and other striking differences in the characteristics of people and bacteria. (10 pts.) |
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