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If alien DNA is introduced using Sal I in pBR322 then

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$β -$ galactosidase help in identifying recombinants

Tetracycline help in identifying recombinants

Ampicillin help in identifying recombinants

White colony help in identifying recombinants

answer is A.

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Detailed Solution

If alien DNA is introduced using Sal I, vector looses tetracycline resistance because Sal I restriction site is present in tetracyclin region. So here in pBR322 tetracycline help in identifying recombinants .

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