The method in which recombinant $DNA$ is directly injected into the nucleus of an animal cell by using microneedles is called:

What is the process of cutting out the $DNA$ bands from the agarose gel and extracting them from the gel piece called?

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:

What is the first step in the Southern blot technique?

In the presence of a chromogenic substrate,recombinant bacteria give:

Mention the main phases included in recombinant $DNA$ technology.