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(A) The experiment described is the Lederberg's replica plating experiment. $1$. Initially,bacterial colonies are grown on a master plate containing a

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Plates with and without streptomycin

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(A) The experiment described is the Lederberg's replica plating experiment. $1$. Initially,bacterial colonies are grown on a master plate containing a non-selective medium (without streptomycin). $2$. $A$ velvet-covered block is used to transfer the pattern of these colonies onto new plates (replica plates). $3$. Some of these replica plates contain streptomycin,while others do not. $4$. By comparing the growth on the streptomycin-containing plates with the original master plate,it is observed that the resistant colonies were already present in the original population before exposure to the antibiotic. $5$. This proves that mutations are pre-adaptive and do not arise as a direct response to the environment (streptomycin).

In the experiment to isolate streptomycin-resistant mutants using the replica plating technique,which proves that such mutations do not arise as an adaptation,what is required to be used for the replica plating?

Similar Questions

$A$ scientist who worked on rats cut their tails up to $21$ successive generations,but at last,he found that the tails remained normal. Which scientist's theory is disapproved by this experiment?

Which technique is used to prove that antibiotic-resistant bacterial mutants are pre-existing and not induced by the environment?

Variations caused by mutation,as proposed by Hugo de Vries,are

Assertion : Natural selection is the outcome of difference in survival and reproduction among individuals that show variation in one or more traits.
Reason : Adaptive forms of a given trait tend to become more common; less adaptive ones become less common or disappear.

Statement-$I$: The fitness according to Darwin,refers ultimately and only to reproductive fitness.
Statement-$II$: Those who are better fit in the environment leave less progeny than others.

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