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mapping_practice_problems - Suggest an explanation for the...

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Practice Problems in Mapping 1. Two-point testcrosses revealed the following map results: pm___________________ss 9 map units pm___________________bb 14 map units a) What are the two possible maps for these loci? b) What cross would resolve the two possible maps? 2. An Hfr strain transfers genes in alphabetical order. When tetracycline sensitivity is used for counterselection, the number of h + tet=r colonies is 1000-fold lower than the number of h + str-r colonies found when streptomycin sensitivity is used for counterselection.
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Unformatted text preview: Suggest an explanation for the difference. 3. Bacterial cells of genotype pur-pro + his + were transduced with P1 bacteriophage grown on bacteria of genotype pur + pro-his-. Transductants containing pur + were selected and tested for the unselected markers pro and his. The numbers of pur + colonies with each of four genotypes are as follows: pro + his + 102 pro-his + 25 pro + his-160 pro-his-1 What is the gene order? Optional problems: Chapter 5: 2, 3, 5, 8, 9, 24, 34 Chapter 6: 2, 7, 8, 9...
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