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Eduncle posted an MCQ
October 19, 2019 • 00:19 am 0 points
  • CSIR NET
  • Life Sciences

Using uninterrupted mating, four Hfr strains were analysed for the sequence in which they transmitted a number of different genes to a F-strain.

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    Eduncle Best Answer

    Only one F factor is integrated into each Hfr strain. Different Hfr strains have the F factor integrated into the chromosome at different locations and in different orientations.
    Therefore, Hfr strains differ with respect to where the transfer of donor genes begins and in what order donor genes transfer. So in this question if analysis is done it clear that The sequence should be ABDFHGJKML (Circular). Site of integration of F plasmid is between A and L ( ABDFH-strain 1), between B and D ( BALMK- strain 2 ), between M and L ( MKJGH- strain 3) and between F and D ( FHGJK- strain 4).

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