In gel electrophoresis,the separated bands of $DNA$ are cut out and extracted from the gel piece. This step is called

What is meant by gene cloning?

Pure $DNA$ precipitated by the addition of chilled ethanol can be removed from the solution by

Which of the following method$(s)$ is used to introduce foreign $DNA$ into host cells?

Which of the following statements is correct in the context of observing $DNA$ separated by agarose gel electrophoresis?

The blue and white selectable markers have been developed which differentiate recombinant colonies from non-recombinant colonies on the basis of their ability to produce colour in the presence of a chromogenic substrate.
Given below are two statements about this method :
Statement-$I$ : The blue coloured colonies have $\text{DNA}$ insert in the plasmid and they are identified as recombinant colonies.
Statement-$II$ : The colonies without blue colour have $\text{DNA}$ insert in the plasmid and are identified as recombinant colonies.
In the light of the above statements,choose the most appropriate answer from the options given below: