NEET Biology question

If a person obtains transformants by inserting a recombinant DNA within the coding sequence of the enzyme beta-galactosidase, he will separate out recombinants from non-recombinants by which of the following observations?

(A)Non-recombinant colonies do not produce any colour whereas recombinants give blue coloured colonies.
(B)Recombinant colonies do not produce any colour whereas non-recombinants give blue coloured colonies.Correct
(C)Recombinants and non-recombinants both produce blue coloured colonies.
(D)No colonies are formed due to insertional inactivation.

Answer: (B)

Solution

Colonies are indeed formed (insertional inactivation does not prevent growth, only colour production), and it is not the non-recombinants that lose colour, but rather the recombinants, in which

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Question ID VK-125249