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Molecular Basis of Inheritance question

2005 · Q69
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Molecular Basis of Inheritance question

2005 · Q69

NEETBiologyMolecular Basis of InheritanceMCQ+4 / −1
Using imprints from a plate with complete medium and carrying bacterial colonies, you can select streptomycin resistant mutants and prove that such mutations do not originates as adaptation. These imprints need to be used -
  1. A
    On plates with minimal medium
  2. B
    Only on plates with streptomycin
  3. C
    Only on plates without streptomycin
  4. D
    On plates with and without streptomycin
View written solutionFree

Correct answer: B

Adaptation is generally due to selection of pre-existing variations and not due to new mutations or variations. This tends to support Darwin’s theory of natural selection. The basis was proved by replica plating experiment of Joshua Lederberg and Esther Lederberg. A number of sterile agar plates having antibiotic streptomycin were prepared. Bacteria were inoculated on the renicilling plates from the master plate by sterile velvet plate. Most bacterial colonies did not form replicas and inoculum died. Moreover a few colonies survived showing that they were resistant to streptomycin.

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