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Direction: A DNA fragment of 5000bp needs to be isolated from E.coli (genome size 4 × 103kb) genomic library. ​

  1. The minimum number of independent recombinant clones required to represent this fragment in ​genomic library are
    1. 16 × 102
    2. 12 × 102​ ​
    3. 8 × 102
    4. 1.25 × 102
Correct Option: C

Given, size of the genome of E. coli ​​​= 4 × 103kb = 4 × 106 bp ​
Size of the DNA fragment = 5000 bp ​
Therefore, minimum number of independent recombinant clones required to represent the DNA fragment in a genomic library ​​ = (4 × 106) / 5000 = 8 × 102



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