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In a generalized transduction system using P1 phage, the donor is pur nad pdx and the recipient is pur nad + + pdx . The donor allele pur is

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In a generalized transduction  system using P1 phage , the donor is  pur + nad + pdx  and the recipient is  pur nad pdx + .  The donor allele   pur +  is initially selected after transduction , and 50  pur +  transductants are then scored for  the other alleles  present. The results follow:  a What is the cotransduction  frequency for  pur  and  nad? b What is the cotransduction  frequency for  pur  and  pdx? c Which of the unselected loci is closest to  pur? d  Are  nad  and  pdx  on the same side or on opposite sides of  pur?  Explain.  (Draw the exchanges needed to produce the various transformant classes under  either order to see which requires the minimum number to produce the results  obtained.)
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